Laws of MotionHard

Question

In the following  arrangement the system is initially at rest. The 5 kg block is now released. Assuming the pulleys teh pulleys and string to massless and smooth, the acceleration of block is

Options

A.aA =
B.aB = 0 m/s2
C.aC = m/s2
D.2aC = aA

Solution


5g - t = 5aA
2T - 8g = aC
aA = ; aC  = ms-2
and aA = 2aC
Here aB  = 0 as T < 10 g

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