A 1.0  kg block collides with a horizontal weightless spring of force constant 2.75 Nm^-1 as show...

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A 1.0  kg block collides with a horizontal weightless spring of force constant 2.75 Nm^-1 as shown in figure. The block compresses the spring 4.0  m from the rest position. If the coefficient of kinetic friction between the block and horizontal surface is 0.25, the speed of the block at the instant of collision is

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But sir block is at rest so intial kinetic energy would be zero.

akshitaporwal