Momentum Questions

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:

Consider the following two statements:(1) Linear momentum of a system of particles is zero.(2) Kinetic energy of system of particles is zero.

A body of mass $m=3.513\text{kg}$ is moving along the $x$ -axis with a speed of $5.00\text{m/s}$. The magnitude of its momentum is recorded as: