How it works
The method, not just the answer.
A good teacher does more than explain. They show you how to think, give you the right questions, catch exactly where you went wrong and make sure you do not forget — and all the while they keep you going: what to study next, what matters for your exam, and the quiet belief that you can do it. Vidyasaarthi builds all of this into every chapter.
01 · Watch
Lessons that show how to think.
Short video lessons by experienced teachers. Each one walks through the idea the way a teacher would at the board — the picture first, then the reasoning, then the trap students usually fall into.
- Short lessons, chapter by chapter
- The method, not only the final answer
- In your own language, with key terms in English for the exam
- v velocity — shrinks, is zero at the top, then grows downward
- g acceleration — the same at every point, always downward
02 · Practise
The questions that actually come.
Questions from past JEE, NEET and board papers, arranged chapter by chapter, so you practise exactly what you have just learnt.
- Past-paper questions, chapter by chapter
- Full solutions, reviewed by teachers
- Daily practice sets and tests, built by teachers
- See a mistake in a solution? Report it — a teacher looks at it
03 · Understand your mistake
A wrong answer is a clue. We follow it.
Most wrong answers are not random. Behind each common one is a usual wrong step. So instead of only showing the right answer, Vidyasaarthi shows three things:
- The usual wrong step
The thought that most often leads to the answer you chose.
- Why it fails
Where exactly that thought breaks.
- The idea to re-read
The one idea that fixes it — and that question returns in your revision.
A ball is thrown straight up. Ignore air resistance. At the highest point of its flight —
What each answer tells us:
Answer A · a very common slip
- The usual wrong step“The ball has stopped, so nothing is acting on it — the acceleration must be zero too.”
- Why it failsAcceleration is how fast the velocity is changing, not how big it is. Just before the top the ball moves up; just after, it moves down — so its velocity is still changing, and gravity is still pulling. If the acceleration really became zero, the ball would stay up there.
- The idea to re-readVelocity and acceleration are different quantities — Motion in a Straight Line.
Answer B · correct
At the top the velocity is zero for just an instant — but gravity never switches off. The acceleration stays g (about 9.8 m/s²), pointing down, through the whole flight. That is exactly what turns the ball around.
Answer C · mixing up height and speed
- The usual wrong step“It is at its highest point, so it must be at its highest speed.”
- Why it failsOn the way up, gravity acts against the motion, so the ball keeps slowing down. It reaches the top because its velocity has fallen to zero. Gravity still acts there, so the acceleration is g, not zero.
- The idea to re-readv = u − gt for motion against gravity — Motion in a Straight Line.
Answer D · direction of motion vs direction of acceleration
- The usual wrong step“The ball was moving up, so its acceleration must point up.”
- Why it failsAcceleration need not point along the motion. Gravity pulls down for the whole flight, on the way up too. That downward acceleration is what slows the ball and turns it around.
- The idea to re-readThe direction of acceleration vs the direction of velocity — Motion in a Straight Line.
A sample of how Vidyasaarthi explains a wrong answer: the usual wrong step, why it fails, and the idea to re-read.
04 · Revise
How revision works. Three days in a row, then a light long tail.
Before every new lecture, you revise the two before it. So each lecture is met on three study days in a row: you learn it, the next day you recall all of it, and the day after you go over only what was weak. Tap a day to see it.
1Day 1 — learn Lecture 1.
1 · 2Day 2 — warm up with a full recall of Lecture 1 (about 4 minutes), then learn Lecture 2.
1 · 2 · 3Day 3 — only what was weak in Lecture 1 (about 2 minutes), a full recall of Lecture 2, then learn Lecture 3.
2 · 3 · 4Day 4 — the weak bits of Lecture 2, a full recall of Lecture 3, then learn Lecture 4.
3 · 4 · 5Day 5 — the weak bits of Lecture 3, a full recall of Lecture 4, then learn Lecture 5.
Recall, never re-watching
Revision means pulling it out of your own head. The format changes every day.
Watching a video again feels like revision, but it is not. Every revision asks you to recall — and in a different way each day, so you remember the idea, not the question. Try them:
- 01 · Fill the formulav² = u² + 2a ?
Show answer
s — the displacement.
- 02 · Which one of the pair?Speed or velocity — which one can be negative?
Show answer
Velocity: it has a direction. Speed is never negative.
- 03 · Which method?A stone is dropped from rest. You know the height and want the time. Which equation do you start with?
Show answer
s = ut + ½at², with u = 0 and a = g.
- 04 · Catch the trap“At the highest point, the acceleration is zero.” True or false?
Show answer
False. It is still g, downward.
- 05 · Picture with a missing labelWhat does the slope of this velocity–time graph give?
Show answer
The acceleration.
- 06 · One mini problemA cycle speeds up from 2 m/s to 10 m/s in 4 s. What is its acceleration?
Show answer
(10 − 2) ÷ 4 = 2 m/s².
The light long tail
What is still weak comes back — before it fades.
After the three days, anything still weak returns after about a week, and again after about three weeks. Each return lifts it back up, and it fades more slowly.
Once a week, a chapter mix
About ten mixed questions from across the chapter — lectures shuffled, the way an exam asks them. It ends on a simple line: this chapter is solid.
A warm-up, never a lock
It feels like the start of a good class.
Revision opens the day gently. It never stands in the way of today’s lesson.
Yesterday we stopped here
Every session opens with a 60-second recap of where you left off.
“You got caught here last time”
Your own trap comes back — the exact mistake you made, not a random question.
A memory meter for every lecture
You see what is fresh and what is fading, lecture by lecture.
Only against your own yesterday
No ranks, no comparing with others. Just you, a little better than yesterday.
Sure or not sure?
One tap before you answer, so a lucky guess is never mistaken for knowing.
Mastered means three days
A question counts as mastered only when you get it right on three different days.
Yesterday we stopped hereVelocity and acceleration are not the same thing. 60-second recap ▸
At the top of its flight, a ball’s acceleration is —
Memory meter
05 · Direction & belief
A teacher also tells you where to go next.
Every day opens with a clear plan — what to revise first, what to learn next, what to practise — so you never wonder what to do. And it notices your progress: a better day than yesterday, a trap you no longer fall into, a question that is finally yours.
That is the part of teaching that keeps a student going. It is built in, not added on.
IllustrationYour plan for today
- Revise firstLecture 2 in full · weak bits of Lecture 1
- Then learnLecture 3 · Velocity and acceleration
- Then practisePast-paper questions on Lecture 3
“You did not fall for the top-point trap today. That one is becoming yours.”
My Notes · Summary cards
Your notebook writes itself.
My Notes builds itself as you learn — the lessons, examples and traps you meet, one tap from the video. And every chapter ends on a summary card: the key results and common traps, for the last look before a test.
My Notes · Motion in a Straight Line
Idea — velocity tells how fast and which way; acceleration tells how fast velocity changes.
Example — ball thrown up: at the top, v = 0 but a = g, down.
Trap — “stopped” does not mean “no acceleration”.
Motion in a Straight Line
- v = u + at
- s = ut + ½at²
- v² = u² + 2as
- Trap: at the top, v = 0 but a = g
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