a rock of mass m is thrown horizontally off a building from a height of 100 m. the speed of the rock as it leaves the thrower's hand at the edge of the building is 10 m/s. how much time does it take the rock to travel from the edge of the building to the ground? group of answer choices 20.4 s 31.6 s 4.52 s 102 s 10.0 s