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A block of weight 4 kg is resting on a s...

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 kg `s^(-1)` and at the speed of 10 m s', then the initial acceleration of the block is

A

`15ms^(-2)`

B

`10 ms^(-2)`

C

`2.5 ms^(-2)`

D

`1 ms^(-2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`(dm)/(dt) = 2kg//s, v = 10 m//s `
`F = v (dm)/(dt) rArr ma = 10 xx 2`
`rArr a = (20)/(4) = 5m//s^(2)` .
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