Stat the law of conservation of momentum
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The law has three definitions

Firstly,

The law of conservation of linear momentum states that in any system of colliding objects the total momentum is always conserved provided that there is no net external force acting on the system.

Secondly

If two or more bodies collide in a closed system,the total momentum after the collision is equal to the total momentum before the collision

Thirdly,

The total momentum of an isolated or closed system of colliding bodies remains constant

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

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