Consider Two Carts,of Masses M and 2m,at Rest on a Frictionless

Multiple Choice

Consider two carts,of masses m and 2m,at rest on a frictionless air track.If you push the first cart for 3 m and then the other for the same length of distance with the same force,which cart undergoes the smallest change in kinetic energy?

A) the cart with mass m
B) the cart with mass 2m
C) The change in kinetic energy is the same in each case.
D) There is no change in kinetic energy in either cart.
E) Impossible to tell.