Question

Which of the following quantity remains constant in a uniform circular motion?

• A.
  
  Acceleration
  
• B.
  Both velocity and speed
• C.
  Velocity
• D.
  Speed

Answer 1

The correct option is D

Speed
Correct Answer: Option (b)

In uniform circular motion, velocity does not remain constant as its direction is changing at every point on the circular path.
The acceleration of the body (centripetal acceleration) undergoing circular motion is always radially towards the centre. For uniform circular motion, the magnitude of this acceleration is constant. But its direction is changing.
Hence, quantity that remains constant in a uniform circular motion is speed.