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Q.

A wooden log of mass 60kg is floating on still water perpendicular to the shore. A boy of mass 40kg is standing at the centre of mass of the log and he is at a distance of 30m from the shore. When he walks through a distance of 10m towards the shore and halts,  now his distance from the shore is

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a

20m

b

24m

c

24

d

30m

answer is B.

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Detailed Solution

X=400100=4             X1=d−s+x =30−10+4 =24m
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A wooden log of mass 60kg is floating on still water perpendicular to the shore. A boy of mass 40kg is standing at the centre of mass of the log and he is at a distance of 30m from the shore. When he walks through a distance of 10m towards the shore and halts,  now his distance from the shore is