At the Same Moment from the Top of a Building

Multiple Choice

At the same moment from the top of a building 3.0 × 10² m tall, one rock is dropped and one is thrown downward with an initial velocity of 10 m/s. Both of them experience negligible air resistance. How much EARLIER does the thrown rock strike the ground?

A) 0.95 s
B) 0.86 s
C) 0.67 s
D) They land at exactly the same time.