Motion in a Straight Line

What you'll learn

A friendly, from-scratch guide to kinematics in one dimension: distance vs displacement, speed vs velocity, acceleration, and the three equations of uniformly accelerated motion, with a full worked example and a clear derivation. Aligned to the NCERT Class 11 syllabus and the foundation for JEE, NEET and CUET.

This chapter has

Motion in a Straight Line — solved practice questions

8 Class 11 Physics questions with step-by-step solutions. Attempt each, then reveal the answer.

1. Q1easy

   A body starts with velocity 5 m/s and accelerates uniformly at 2 m/s^2. Its velocity after 3 s is:

   • A6 m/s
   • B11 m/s
   • C16 m/s
   • D30 m/s
   Show answer & solution

   Correct answer: (B) 11 m/s

   Using v = u + at = 5 + 2 × 3 = 11 m/s.

2. Q2easy

   Which of the following is a vector quantity?

   • ADistance
   • BSpeed
   • CDisplacement
   • DTime
   Show answer & solution

   Correct answer: (C) Displacement

   Displacement has both magnitude and direction, so it is a vector. Distance, speed and time are scalars.

3. Q3medium

   A body starting from rest moves with a uniform acceleration of 2 m/s^2. The distance covered in 5 s is:

   • A25 m
   • B10 m
   • C20 m
   • D50 m
   Show answer & solution

   Correct answer: (A) 25 m

   Using s = ut + ½at^2 = 0 + ½ × 2 × 5^2 = 25 m.

4. Q4medium

   A car moving at 20 m/s is brought to rest by a uniform deceleration of 5 m/s^2. The distance travelled before stopping is:

   • A80 m
   • B40 m
   • C20 m
   • D200 m
   Show answer & solution

   Correct answer: (B) 40 m

   Using v^2 = u^2 - 2as with v = 0: s = u^2/(2a) = 400/10 = 40 m.

5. Q5easy

   The slope of a velocity–time graph gives the:

   • ADisplacement
   • BVelocity
   • CAcceleration
   • DDistance
   Show answer & solution

   Correct answer: (C) Acceleration

   The slope of a velocity–time graph equals the rate of change of velocity, i.e. the acceleration.

6. Q6easy

   The area under a velocity–time graph gives the:

   • ADisplacement
   • BAcceleration
   • CSpeed
   • DJerk
   Show answer & solution

   Correct answer: (A) Displacement

   The area enclosed between a velocity–time graph and the time axis equals the displacement of the body.

7. Q7medium

   A ball is dropped from rest. Taking g = 10 m/s^2, its speed after 2 s is:

   • A20 m/s
   • B10 m/s
   • C5 m/s
   • D40 m/s
   Show answer & solution

   Correct answer: (A) 20 m/s

   For free fall from rest, v = gt = 10 × 2 = 20 m/s.

8. Q8medium

   A stone is dropped from rest. Taking g = 10 m/s^2, the distance it falls in the first 2 s is:

   • A10 m
   • B20 m
   • C40 m
   • D5 m
   Show answer & solution

   Correct answer: (B) 20 m

   Using h = ½gt^2 = ½ × 10 × 2^2 = 20 m.

Want the full set? Practise all 15 Motion in a Straight Line questions →