Question

Two students are standing on a fire escape, one twice as high as the other. Simultaneously, each drops a ball. If the first ball strikes the ground at time Dt, when will the second ball strike the ground? (Disregard air resistance. Assume a = -g = -9.81 m/s.)
a.
delta Dt = delta 4Dt
c.
delta Dt = delta Dt
b.
delta Dt = delta 2Dt
d.
delta Dt = delta Dt