Find out the velocity of block B in a pulley block system as shown in figure.
Block A is moving with velocity 8 ms–1.
Velocity of every point on the string must be 8m/s along the string.
The real velocity of B is vB.
Then the string will not break only when the component of vB along string is 8 m/s.
vB cos 37° = 8 ⇒ vB = 8/cos 37°= 10 m/s.
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