Work done by tension in circular motion · CAP 2003 #7

Physics · mechanics

Problem

A person is swinging a ball at the end of a string of length

\ell

with constant speed

v

. The work done by the tension

T

in the string over one revolution is (a)

0

; (b)

mv^2/2

; (c)

2\pi \ell T

; (d) undetermined by the information given.