You push crate "A" of mass M across a frictionless floor with
constant force F. At the same time a friend pushes crate "B" of mass
2M across the floor with 2xF. When you have finished:
A. KEB = 4KEA
B. KEB = 2KEA
C. KEB = 1.4KEA
D. KEB = KEA
E. KEB = 1/2 KEA
You throw ball "A" upward with velocity vA. A friend
throws identical ball "B" upward with vB = 2 vA.