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Kinetic Energy: KE = (1/2)mv^2

Momentum: P = mv

Would you have to have a smaller mass for Z so that it would recoil with greater KE than Y?

And for momentum would you have to have a larger mass for Z so it would recoil with greatre momentum?

How do you explain them in terms of the equations? I think I understand the momentum....if you plug in larger mass than you have a larger P...but KE I'm not sure? Wouldn't you also have a larger KE if you plugged in larger mass? If Z was really large it wouldn't move it all so I would think it would have to be small would it not?