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Figure shown a block P of mass m resting...

Figure shown a block P of mass m resting on a smooth horizontal surface, attached to a spring of force constant k which is rigidly fixed on the wall on left side, shown in the figure . At a distance l to the right of the block there is a rigid wall. If block is pushed towards loft so that spring is comparessed by a distance `5l//3` and when released, if will starts its oscillations. If collision of block with the wall is consdered to be perfectly elastic. Find the time period of oscillation of the block.

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