A boat os mass 40kg is at rest. A dog of mass 4kg moves in the boat with a velocity of 10m/s. What is the velocity of boat(nearly)?

4 m/s

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-1 m/s

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8 m/s

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7 m/s

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Solution

The correct option is B -1 m/s
Initial momentum $= 0$
so, final momentum $= 0$
$\begin{matrix} 40 \times v + 4 \times 10 = 0 v = - 1 m / s \end{matrix}$
Hence,Option $B$ is correct.

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A boat os mass 40kg is at rest. A dog of mass 4kg moves in the boat with a velocity of 10m/s. What is the velocity of boat(nearly)?

The correct option is B -1 m/sInitial momentum =0so, final momentum =040×v+4×10=0v=−1m/sHence,Option B is correct.

The correct option is B -1 m/s
Initial momentum $= 0$
so, final momentum $= 0$
$\begin{matrix} 40 \times v + 4 \times 10 = 0 v = - 1 m / s \end{matrix}$
Hence,Option $B$ is correct.