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in Physics by (61.3k points)
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A motor is fixed inside a box which is moving upwards with velocity 5 m/s. String is winding at the rate 3 m/s. Then the velocity of block A will be:

(A)  2.5 m/s downwards 2.5 m/s

(B)  5 m/s downwards 5 m/s 

(C)  1 m/s downwards 1 m/s 

(D)  2 m/s downwards

1 Answer

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Best answer

Correct option (C) 1 m/s downwards

Explanation:

Velocity of a point on spring near motor VM = 5 m/s

upwards

– 3m/s downwards = 2m/s

upwards From constrant relation

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