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A 20 kg block attached to a spring of spring constant 5 N/m is released from rest at A. The spring at this instant is having an elongation of 1m. The block is allowed to move in smooth horizontal slot with the help of constant force of 50 N in the rope as shown. The velocity of block as it reaches B (in m/sec) is.

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answer is 2.

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Detailed Solution

By the work energy principle wex+wspring=ΔK.E 50×2−(5×522−5×122)=12mV2 100−60=12×20V2 V=2m/sec

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A 20 kg block attached to a spring of spring constant 5 N/m is released from rest at A. The spring at this instant is having an elongation of 1m. The block is allowed to move in smooth horizontal slot with the help of constant force of 50 N in the rope as shown. The velocity of block as it reaches B (in m/sec) is.