Question

Two boys (same height) are standing on a bridge each boy throws a rock straight down into the river below. they throw the rock at the same time, but one rock hits the water before the other one. how is this possible? g

Answer 1

Gravity accelerates all rocks equally. If one rock landed before the other one did, it must have been thrown harder, and had greater initial speed.

Answer 2

Perhaps one threw it at a greater velocity?