Two Cannonballs Are Dropped from a Second Floor Physics Lab

Multiple Choice

Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, K_A and K_B, is

A) K_A = 4K_B.
B) K_A = 2K_B.
C) K_A = K_B.
D) K_B = 2K_A.
E) K_B = 4K_A.