Question 22 of 172

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 is 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]

(1) mv2r×πr

(2) Zero

(3) mv2r2

(4) πr2mv2