Question

At the instant a ball is thrown horizontally; an identical ball is dropped from the same
height, which ball hits the ground first? (No air resistance). A. The horizontal thrown ball
B. they both hit the ground at the same time C. The dropped ball D. None of the above

Answer 1

B. they both hit the ground at the same time.

Explanation: vertical motion is independent of horizontal motion. Both balls start with the same vertical position and the same initial vertical velocity (zero), and both accelerate downward at g, so their fall time is t = sqrt(2h/g).