In the arrangement, shown in the figure, the ends P and Q of a stretchable string move downwards with uniform speed u. Pulleys A and B are fixed. Mass M moves upwards with a speed
1
2u cos θ
2
u/ cos θ
3
2u/ cos θ
4
u cos θ
In the arrangement, shown in the figure, the ends P and Q of a stretchable string move downwards with uniform speed u. Pulleys A and B are fixed. Mass M moves upwards with a speed