Laws of MotionHard

Question

In the figure shown the blocks  A & C are pulled down with constant velocities u. Acceleration of block B is :

Options

A. tan2 θ sec θ
B. tan3 θ
C. sec2 θ tan θ
D.Zero

Solution


v cos θ = u
v = u sec θ
= u sec θ tan θ ........... I
tan θ =
sec2θ
 = + cos2θ
 = cos θu
= tan2θ    .............. II
⇒ tan3θ from I and II 

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