Hard
Question
In the arrangement shown in the figure the ends P and Q of an unstale string move downwards with uniform speed U. Pully A and B are fixed. Mass M moves upwards with a speed
Options
A.2U cos θ
B.U/cos θ
C.2U/cos θ
D.U/cos θ
Solution
In a right angle ᐃRQR
l2 = 2 + y2
Differentiating this equation with respect to time, we get
2l
= 0 + 2y
or
= 
Here, -
= vm
= 
and -
= U Hence, vm =
∴ Correct option is (b).
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