A ball is projected horizontally from the top of a cliff. At the same moment, a second identical ball is dropped from rest from the same location. Which ball lands on the ground first? Assume free fall motion.
1. The horizontally projected ball lands on the ground first.2. The ball dropped from rest lands on the ground first.3. Both balls land on the ground at the same time.

First ball is thrown with horizontal velocity while other ball is dropped from cliff such that both have zero vertical velocity. So both balls have to cover a distance equal to the height of cliff with same initial velocity.

time taken is given by [tex]t=\sqrt{\frac{2h}{g}}[/tex]

where h=height of cliff

g=acceleration due to gravity

horizontal velocity to first ball will make the ball to travel more horizontal distance as compared to second ball.

Option 3 is correct