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Question

Neha swims in a pool that is 50 metres long. She covers 100 metres in 1 minute by swimming from one end of the pool to the other and back along the same straight path. Find her average velocity (in m/s).

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

0 m/s

The question asks for the average velocity, not the average speed. Velocity is a vector quantity, meaning it has both magnitude and direction. Speed is a scalar quantity, only having magnitude.

Neha swims 100 meters in 1 minute. To calculate her average speed, we would divide the total distance by the total time: 100 meters / 60 seconds ≈ 1.67 m/s. However, the question asks for average velocity.

Since Neha starts and finishes at the same point, her displacement is zero. Average velocity is calculated as the total displacement divided by the total time. Therefore:

Average velocity = Total displacement / Total time = 0 meters / 60 seconds = 0 m/s

The correct answer is 0 m/s because her net displacement is zero.

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Important Questions from Motion

  1. The motion of a particle of mass m is described by the relation, y = ut - 1⁄2 gt2, where u is the initial velocity of the particle. The force acting on the particle is

  2. The rate of change in the velocity of an object per unit time is referred as ________.

  3. Which of the following is a correct equation of motion?

  4. The acceleration of an object is said to be _______ when an object travels in a straight line and its velocity increases or decreases by an equal amounts in equal intervals of time.          

  5. What is the friction force employed between the two surfaces interacted in relative speed?

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