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Q.

A block of mass 2 kg is tied to elastic thread of length 2 m and suspended to point O. Initially block is horizontal level to thispoint O. Now block is released and its speed is 5 m/s when thread is vertical. If the acceleration of the block at the lowestposition is 2.5 K. Find the value of K.

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Detailed Solution

M.E. Conservationmg(4)−k2x2=12mv2 kx=55 −mg+kx=ma 55−20=2a a=17.5m/sec2
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