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Relative Velocity

A block of me...

Question

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 $k g s^{- 1}$ and at a speed of 5 $m s^{- 1}$ . The initial acceleration of the block is

A

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B

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C

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D

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Solution

The correct option is D

F = v $\frac{d m}{d t}$
F = 5 (1) = 5N
$∴$ a = $\frac{F}{m}$ = $\frac{5}{2} m / s^{2}$

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