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Questions  

A block is dragged on a smooth plane with the help of a rope which moves with a velocity  as shown in figure. The horizontal velocity of the block is

a
v
b
vsin⁡θ
c
vsin⁡θ
d
vcos⁡θ

detailed solution

Correct option is B

L2=x2+y2 ∴y= constant 2LdLdt=2xdxdt ⇒dxdt=LxV  Horizontal velocity vx=vsin⁡θ xL=sin⁡θ  or  vx−vsin⁡θ

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