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Question

At a given instant, A is moving with velocity of 5 m/s upwards. What is velocity of B at that time ?

A
15 m/s
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B
15 m/s
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C
5 m/s
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D
5 m/s
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Solution

The correct option is A 15 m/s
Let the displacements of A and B be X and Y respectively.

Using work done by tension method, (net work - done by tension is zero, since it is an internal force)
3TX+TY=0Y=3X
Differentiating,
VB=3VA=3(+5)=15 ms1=15 ms1downwards

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