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A person weighing 60kg in a small boat of mass 140kg which is at rest, throws a 5kg stone in the horizontal direction with a velocity of $14 {ms}^{- 1}$ . The velocity of the boat immediately after the throw is $(in m/s)$

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0.35

0.5

1.2

0.65

answer is C.

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Detailed Solution

M – mass of person and boat = 200 kg

$m_{1} = 5 kg, u_{1} = 14 m/s$

u = Velocity of boat passed with stone threw

$MU = m_{1} u_{1}$

$200 U = 5 \times 14$

$U = \frac{70}{200}$

$= 0.35 m/s$

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