A rock is dropped at the same instant that a ball at the same height is thrown horizontally. which will will have the greater speed when it reaches the ground? ball rock both will reach at the same time impossible to answer

They will both hit the ground at the same time due to gravity.

that means they took the same time to travel the distance to the ground

however, the ball traveled farther

speed=distance (or displacement) divided by time

so the greater the distance, the greater the speed

the ball traveled faster in the same time so it traveled faster

answer is ball