A block of weight 4 kg is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of 2 `kgs^(-1)` and at the speed of 10 `ms^(-1)`, then the initial acceleration of the block is

Options

A. `15ms^(-2)`
B. `10ms^(-2)`
C. `2.5ms^(-2)`
D. `5ms^(-2)`

Answer

D

Explanation

`F=(dm)/(dt).v=2xx10`
The initial acceleration of block
`a=(F)/(m)=(2kgs^(-1)xx10ms^(-2))/(4)`
`=(20)/(4)=5ms^(-2)`