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Q.

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 of14ms−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

M – mass of person and boat = 200 kg

m1=5kg,  u1=14 m/s

u = Velocity of boat passed with stone threw

MU=m1u1

200 U=5×14

U=70200

=0.35 m/s

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