A 40 kg girl is running along a circular path of radius 1 m with a uniform speed. How much work is done by the girl in completing one circle?

fo circle

mass=40 kg

radius=1m

here force wiil be

force=m x v2 1

f=40 x v2 1

so ; v2=f 40

work done=1 2 mv2  ;  bcoz it is moving so it will have velocity

wd=12 x 40 x f 40

wd= f 40 joules