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Question

Find the velocity (VA) of block A in the shown figure.

A
14 m/s downwards.
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B
16 m/s upwards.
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C
12 m/s downwards.
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D
10 m/s upwards.
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Solution

The correct option is B 16 m/s upwards.
Given the condition

As per the pulley formula, taking upward positive, we have
VP=VA+VB2
Now, suppose the block A moves upward, then we have
VP=VA+VB2 10=VA+42
VA=16 m/s
Hence, velocity of block A is 16 m/s upwards.

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