"Gravity gets stronger when there's more mass and weaker when you get farther away" tells you very little.
"A whole lot of energy can come from just a little tiny bit of mass" tells you very little.
And "The speed of light is very very very very very fast" tells you almost nothing.
momm=massxvelocity
momm=1200x2.5=120x25=600x5=3000kgm/s
