In the figure shown the velocity of lift is 2 m/s while string is winding on the motor shaft with velocity 2 m/s and block A is moving downwards with a velocity of 2 m/s, then find out the velocity of block B.
A
2 m/s ↑
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B
2 m/s ↓
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C
4 m/s ↑
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D
none of these
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Solution
The correct option is D none of these Given,
Velocity of lift VL=2m/s↑
Velocity of string Vstring=2m/s
Let length of string is l
Here,
−dldt=2m/s
Velocity of Block VB=2m/s↓
Let displacement of block B is y and displacement of block A is x then,