Question

A particle is moving with constant speed along a straight line. Mark out the correct statement(s) for this situation.

• A. Average speed is always equal to the magnitude of average velocity
• B. Particle is having zero acceleration.
• C. Velocity of the particle is constant.
• D. Acceleration of the particle is constant and having non-zero value.

Answer 1

Answer: (A), (B), (C)

Velocity of the particle is constant.

The explanation for the correct options:

Option A:

• For constant speed, the magnitude of the average velocity and the average speed will always be the same because their distance and displacement will be the same for a particular time interval.

Option B:

• Due to constant speed, there is no difference between starting velocity and ending velocity so acceleration will be zero.
• Hence, the particle is having zero acceleration.

Option C:

• As the initial velocity and final velocity are the same, the velocity is constant for this motion.

The explanation for the incorrect option:

Option D:

• When a particle is moving at a constant speed its acceleration is zero.

Hence, options A, B, and C are correct.