Laws of MotionHard
Question
System is shown in the figure and man is pulling the rope from both sides with constant speed ′u′. Then the speed of the block will be (M moves vertical):
Options
A.
B.
C.
D.none of these
Solution
∵ Vp = 
Pulley P1
u =
...........(1)
Pulley P2
v =
⇒ 2V = V1 + V2 .....(2)
Eliminate V1 & V2 to get
⇒ 2u + u − 2u = 2v ⇒ 3u = 4v
v = 3/4 u Ans.
Pulley P1
u =
...........(1)Pulley P2
v =
⇒ 2V = V1 + V2 .....(2)Eliminate V1 & V2 to get
⇒ 2u + u − 2u = 2v ⇒ 3u = 4v
v = 3/4 u Ans.
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