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Q.

A wooden log of mass 120kg is floating on still water perpendicular to the shore. A man of mass 80 kg is standing at the centre of mass of the log and he is at 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

30m

b

20m

c

12m

d

24m

answer is B.

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Detailed Solution

Let the man displaces by 'x' by the time man walks 10m on the wooden log

The displacement of the man will be  10-x w.r.t ground.

since there is no external force actin on the system, the c.o.m will not move

120(10-x)=80x

⇒x = 80 x 1080 x 120 = 4m ∴Distance from the shore=(30 - 10) + 4 = 24m

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