Question

A stone is tied to one end of a light inextensible string.of length l and made to rotate on a verticle circle keeping other end of the string at the centre .if speed of stone at highest point is v then.its speed at lowest point is

Answer 1

Radius=l

V(lower)=v

V(topmost)=v°

Ki+Ui=Kf+Uf

1/2mv^2+0=1/2mv°^2+mgh

h=2l

1/2mv^2=1/2mv°^2+2mgl

V^2=v°2+4gl