No , I mean it has a acceleration of 40 m/s/s as it strikes
the earth.

we can say that the collision is inelastic so when the two
collide they do not deform , the 100kg mass transfers its force to the earth.

why didnt you say it strikes the earth with a 8000N force

its the same mass and the same acceleration as in the example.
the 100kg mass can not tell if its hitting the earth or being turned around in the pipe.

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