A uniform cylinder of radius `'r'` length `'L'` and mass `'m'` is lying on the ground with the curved surface touching the ground. F it is to be oriented on the ground with the flat circular end in contact with ground, the work to be done is

Options

A. `mg[(L//2)-r]`
B. `mL[(g//2)-r]`
C. `mr(gL-1)`
D. `mg Lr`

Answer

A

Explanation

`W = U_(i)-U_(f)` , where `U_(i) = mgh_(1)` , `U_(f) = mgh_(2)`,
`:. W = mg(h_(1)-h_(2))`