A spring is attached with a block of mass m and a fixed horizontal roof as shown. The block is lying on a smooth horizontal table and initially the spring is vertical and unstretched. Natural length of spring is 3l_(0). A constant horizontal force F is applied on the block so that block moves inthe directionof force. When length of the spring becomes 5l_(0), block leaves contact with the table. Find the constant force F, if initial and final velocity of block is zero.

A spring is attached with a block of mass m and a fixed horizontal roo

1.	A spring is attached with a block of mass m and a fixed horizontal roof as shown. The block is lying on a smooth horizontal table and initially the spring is vertical and unstretched. Natural length of spring is 3l_(0). A constant horizontal force F is applied on the block so that block moves inthe directionof force. When length of the spring becomes 5l_(0), block leaves contact with the table. Find the constant force F, if initial and final velocity of block is zero.
Answer» ANSWER :`F=(5)/(12)`MG.

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