Questions
A block of mass m shown in figure is in equilibrium. If it is displaced downward further by x and released find its acceleration just after it is released. Take pulleys to be light and smooth and strings light.
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Correct option is C
Initially the block is at rest action of force 2T upward and mg downwards. When the block is pulled downwards by x, the spring extends by 2x. Hence tension T increases by 2kx. Thus the net unbalanced force on block of mass m is 4kx.∴ Acceleration of the block = 4kxmSimilar Questions
Two masses of I kg and 5 kg are attached to the ends of a massless string passing over a pulley of negligible weight. The pulley itself is attached to a light spring balance as shown in figure. The masses start moving during this interval; the reading of spring balance will be:
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