Two Masses, M_A and M_B, with M_B = 2M_A, Are

Multiple Choice

Two masses, M_A and M_B, with M_B = 2M_A, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen for equal times, we find that

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