In the arrangement shown, the pulleys and the string are ideal. The acceleration of block `B` is.

Options

A. `g//5`
B. `g//2`
C. `2g//5`
D. `2g//3`

Answer

C

Explanation

For `B` : `mg-T=ma`
For `A` : `2T-mg=(ma)/(2)` implies `mg=(5)/(2)ma`
`a=(2g)/(5)` .