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Q.

A ship A is moving Westwards with a speed of 10 km h–1 and a ship B 100 km South of A, is moving Northwards with a speed of 10 km h–1 . The time after which the distance between them becomes shortest,is

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a

52h

b

102h

c

5h

d

0 h

answer is C.

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Detailed Solution

VA=−10 i^ VB=10j^VA−VB=−10i^−10j^θ=450,x=1002 kmvrel=102 kmt=xvrel=100/2102=1002×10=5 hrs
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