Question

If a body is moving at constant speed in a circular path, its

• A. velocity is constant and its acceleration is zero
• B. velocity and acceleration are both changing directions only
• C. velocity and acceleration are both increasing
• D. velocity is constant and acceleration is changing direction

Answer 1

The correct option is B

velocity and acceleration are both changing directions only

The explanation for the correct option

B: velocity and acceleration are both changing directions only

(1)We know that velocity and acceleration are vector quantities. Which means they depend on both magnitude and direction.

(2)Even if the body is moving at a constant speed in a circular path but its direction keeps on changing. So, velocity will also change but the magnitude remains the same.

(3)We know that acceleration is the rate of change of velocity with respect to time. So, acceleration will also change in direction with constant acceleration.

Hence option B is correct, the velocity and acceleration both are changing direction only.