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A 20 kg block placed on a level frictionless surface is attached to a cord which
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A 20 kg block placed on a level frictionless surface is attached to a cord which passes over two small frictionless pulleys,as shown in figure-2.167,to a hanging block originally at rest 1m above the floor. If the hanging block strikes the floor 2 s after the system is released, the weight of the hanging block is :
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