Question

What is the velocity of block B?

• A. 1 m/s in downward direction
• B. 1 m/s in upward direction
• C. 2 m/s in downward direction
• D. 2 m/s in upward direction

Answer 1

The correct option is B

1 m/s in upward direction

Suppose block B moves up by "x" distance.

So, 4x length of string will be free and block A will descend by 4x distance and $v_A=4v_B$
If velocity of block A is 4 m/s downwards, velocity of A will be 1 m/s upwards.