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Q.

A person weighing 60 kg in a small boat of mass 140 kg which is at rest, throws a 5 kg 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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a

1.2

b

0.5

c

0.35

d

0.65

answer is C.

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Detailed Solution

m1u1 + m2u2 = m1v1 + m2v2

5×14=60+140v

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A person weighing 60 kg in a small boat of mass 140 kg which is at rest, throws a 5 kg 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)