Answer:

Explanation:
As we know by radioactivity law

so here we will have


now we will have


now we also know that



Momentum = (mass) x (speed)
Momentum = (70 kg) x (10 m/s)
<em>Momentum = 700 kg-m/s</em>
<span>141.6 million mi,and idk what u mean by how</span>
The amount of matter in an object ismass....anything that occupies spaca and has weight is called matter.....