I tried to use the velocity that the mass has as it strikes.

you demanded acceleration as it strikes.

then I used acceleration as it strikes.

then you say that is wrong , let me ask you the question
and you plug in whatever you require.

the 100kg mass is traveling at a speed of 40 m/s
the 100kg mass strikes the earth , what force will the mass apply to the earth?

4000N or 8000N

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.