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Q.

A block of mass 5 kg is at rest on a smooth horizontal surface. Water coming out of a pipe horizontally at the rate of 2 kg s–1, hits the block with a velocity of 6ms–1. The initial acceleration of the block is,

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a

1.2 ms−2

b

2.4 ms−2

c

0.6 ms−2

d

Zero

answer is C.

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Detailed Solution

The force on the block will be the given by 

Force=  rate of water coming out x velocity of the water.

F=2x6=12N

So, the initial acceleration will be a=Fm=125=2.4ms-2

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