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Q.

A  block of metal weighing 2 kg is resting on a frictionless plane. It is  struck by a jet releasing water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block will be

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a

2.5ms2

b

5ms2

c

10ms2

d

20ms2

answer is A.

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Detailed Solution

F=dpdt,F=Vdmdt,a=Fm

F=5×1 N

a=52=2.5 m/s2

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