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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

11.6 m

b

8.4 m

c

9.6 m

d

10.4 m

answer is B.

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Detailed Solution

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distance of dog from shore =d-x+mxm+M
=10-2+20(2)20+30=8-25=8.4m

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