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A girl of mass 50 kg jumps out of a rowing boat of mass 300 kg on to the bank with a horizontal velocity of $3$ $m / s$ . With what velocity does the boat begin to move backwards

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$0.7 m s^{- 1}$

$0.6 m s^{- 1}$

$0.5 m s^{- 1}$

$0.55 m s^{- 1}$

answer is B.

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Detailed Solution

Mass of the girl $=$ $50 k g$

Mass of the boat $= 300 k g$

Velocity of the girl $= 3 m / s$

$M V = m v V = \frac{m v}{M} = \frac{50 \times 3}{300} = 0.5 m s^{- 1}$

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