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Q.

A boat of mass 80 kg is floating on still water. A dog of mass 20 kg on the boat is at a distance of 10m from the shore. The dog moves on the boat by a distance of 2m towards the shore. The distance of the dog from the shore is

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a

11.6m

b

8.4m

c

9.6m

d

10.4m

answer is B.

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Detailed Solution

distance of dog from shore Alternative Solution:Position of centre of the system remains fixed. If x be the displacement of the boat away from the shore, then using distanc of dog = (10+ 0.4 - 2)m = 8.4m
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