Question

A boy is whirling a stone tied at one end such that the stone is in uniform circular motion.Which of the following statement is correct?

• A. The velocity of stone at A is equal to the velocity of stone B
• B. The speed of stone at A is equal to the speed of stone at B.
• C. The centripetal force is radially outward in the string.
• D. All of the above statements are correct.

Answer 1

Answer: (B)

The speed of stone at A is equal to the speed of stone at B.

In uniform circular motion speed is constant while velocity being a vector quantity is constantly changing as its direction keeps changing. Centripetal force acts inwards towards the center to counterbalance the centrifugal force acting outwards from the center.