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Motion in a Straight Line is the chapter every other mechanics chapter is built on. The equations are three lines long, but under a clock students still mix up distance with displacement and speed with velocity. Ten questions below, with the answer key and a hint for each.
What this chapter carries in NEET(UG)
- Usually 1 to 2 questions every year, which is 4 to 8 marks.
- Most of them come from the three equations of motion, free fall and graphs.
- The marks lost here are almost always lost to a sign, not to the physics.
What the syllabus says
In the syllabus (Unit 2, Kinematics): Frame of reference, motion in a straight line, speed and velocity, uniform and non-uniform motion, average speed and instantaneous velocity, uniformly accelerated motion, velocity–time and position–time graphs, relations for uniformly accelerated motion, relative velocity.
Taken out in 2024: elementary concepts of differentiation and integration for describing motion.
Taken from the NMC syllabus for NEET (UG) 2026, the latest one published. See the full syllabus, unit by unit.
Formulas you must know by heart
| First equation | v = u + at |
| Second equation | s = ut + ½at2 |
| Third equation | v2 = u2 + 2as |
| Distance in the nth second | sn = u + a(2n − 1)/2 |
| Average velocity | displacement ÷ time |
| Average speed | total distance ÷ total time |
| Free fall from rest | v = gt, h = ½gt2 |
| Slope of a velocity-time graph | acceleration |
| Area under a velocity-time graph | displacement |
The three equations in the first rows only work when the acceleration is constant. Check that before you use them.
Ten questions. Give yourself ten minutes.
Write your answers down before you scroll. A question you looked up is a question you have not answered.
Q1. A body starts from rest and moves with a constant acceleration of 2 m/s². Its speed after 5 s is
- (a) 2 m/s
- (b) 5 m/s
- (c) 10 m/s
- (d) 20 m/s
Q2. A car travelling at 20 m/s comes to rest in 4 s. Its acceleration is
- (a) −2 m/s²
- (b) −5 m/s²
- (c) 5 m/s²
- (d) 80 m/s²
Q3. A body is dropped from rest. Taking g = 10 m/s², the distance it falls in the first 2 s is
- (a) 10 m
- (b) 20 m
- (c) 40 m
- (d) 5 m
Q4. A body moves once round a circular track and returns to its starting point. Its displacement is
- (a) equal to the circumference
- (b) half the circumference
- (c) zero
- (d) equal to the diameter
Q5. The area under a velocity-time graph gives the
- (a) acceleration
- (b) displacement
- (c) force
- (d) average speed
Q6. The slope of a velocity-time graph gives the
- (a) displacement
- (b) distance
- (c) acceleration
- (d) velocity
Q7. A body starts from rest with constant acceleration a. The distance covered in time t is
- (a) at
- (b) at2
- (c) ½at2
- (d) 2at2
Q8. A ball is thrown straight up. At the highest point its velocity and acceleration are
- (a) both zero
- (b) velocity zero, acceleration g downwards
- (c) velocity g, acceleration zero
- (d) both equal to g
Q9. A body travels half its journey at 20 m/s and the other half at 30 m/s. Its average speed is
- (a) 24 m/s
- (b) 25 m/s
- (c) 26 m/s
- (d) 50 m/s
Q10. Which of these can be zero while the body is still moving?
- (a) speed
- (b) distance travelled
- (c) displacement
- (d) time
Answer key, with a hint for each
| Q1 | (c) | v = u + at = 0 + 2 × 5 = 10 m/s. |
| Q2 | (b) | a = (v − u)/t = (0 − 20)/4 = −5 m/s². The minus sign says it is slowing down. |
| Q3 | (b) | h = ½gt2 = ½ × 10 × 4 = 20 m. |
| Q4 | (c) | It ends where it started, so the displacement is zero even though the distance is not. |
| Q5 | (b) | Area under a v-t graph is displacement. Slope is acceleration. |
| Q6 | (c) | Slope of a velocity-time graph is the rate of change of velocity, which is acceleration. |
| Q7 | (c) | s = ut + ½at2, and u = 0, so s = ½at2. |
| Q8 | (b) | Velocity becomes zero for an instant, but gravity never switches off, so a = g downwards. |
| Q9 | (a) | For equal distances use 2v1v2/(v1 + v2) = 2 × 20 × 30/50 = 24 m/s, not the plain average of 25. |
| Q10 | (c) | A body can return to its start, making displacement zero while it is still moving. |
Now mark yourself honestly
NEET(UG) marks the way it marks. Use the same rule here:
- +4 for a right answer
- −1 for a wrong one
- 0 for a blank
So ten questions here are out of 40. In the real paper, 45 Physics questions are out of 180.
If you scored 32 or more, the basics of this chapter are secure. Move to harder questions, not more of these.
If you scored below 24, do not feel bad about it. You have just found out something useful before the exam did. Go back to the formula table above, learn it properly, and sit these ten again tomorrow.
And if you guessed a few and they landed, count those as wrong. A guess that works once will not work in May.
The full chapter, on a clock
Ten questions tell you a little. Forty-five tell you the truth.
The Beginner paper for Motion in a Straight Line is waiting for you on the portal: 45 questions, 45 minutes, marked out of 180, with the answer key and a hint for every question. Sit it tonight and you will know exactly where this chapter stands.
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