jee-main 2005 Q20

jee-main · India Momentum and Collisions Collision with Spring System
The block of mass $M$ moving on the frictionless horizontal surface collides with a spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is
(1) $\sqrt{\mathrm{MK}}\,\mathrm{L}$
(2) $\frac{\mathrm{KL}^2}{2\mathrm{M}}$
(3) zero
(4) $\frac{ML^2}{\mathrm{K}}$ 
The block of mass $M$ moving on the frictionless horizontal surface collides with a spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is\\
(1) $\sqrt{\mathrm{MK}}\,\mathrm{L}$\\
(2) $\frac{\mathrm{KL}^2}{2\mathrm{M}}$\\
(3) zero\\
(4) $\frac{ML^2}{\mathrm{K}}$
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