Kinematics Question 701

Question: A body of mass m is moving in a circle of radius r with a constant speed v . The force on the body is mv2r and it’s directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle[NCERT 1977; RPET 1999]

Options:

A) mv2r×πr

B)Zero

C) mv2r2

D) πr2mv2

Show Answer

Answer:

Correct Answer: B

Solution:

Work done by centripetal force is always zero.

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