Question

7.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.

Reason: With no air resistance the horizontal motion does not affect the vertical motion. Both balls have the same initial vertical velocity (zero) and accelerate downward at g, so the fall time is t = sqrt(2h/g) for both.