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Q.

A boy of mass 50 kg is standing at one end of boat of length 9m and mass 400 kg. He runs to the other end, the distance through which CM of boat boy system moves is

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a

0

b

1m

c

2m

d

3m

answer is A.

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Detailed Solution

If boat is taken to be moved due to internal forces generated due to running of the boy to the other end then change in Centre of mass is zero. (CM of boat and boy system does not depends on internal forces so answer is ‘0’.)

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