A body of mass m is moving in a circle of radius 'r' with a constant speed v. The force on the body is `(mv^(2))/(r)` and is r directed towards the center. If work done by this force in moving the body over half the circumference and complete circumference is W and W', then:

Options

A. `W = (mv^(2))/(r). pi, W' =` zero
B. `W = (mv^(2))/(r). 2r, W' =` zero
C. `W = (mv^(2))/(r), W' = (mv^(2))/(r).2pi r`
D. W = zero, W' zero

Answer

D