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Question

If the boat crosses the river in shortest possible time, then its drift will be:-
1100702_77effa18b52d4c4bb3892921f3d0f913.png

A
zero
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B
250 m
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C
125 m
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D
2503 m
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Solution

The correct option is A 250 m
vb=4,vr=2,d=500m
For shortest possible time vb should be along AB
t=dvb
t=5004=125sec
drift : horizontal displacement of the boat
drift = vr×t
=2×125
=250m

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