Solve the all parts of given problem:
Problem: A hoodlum throws a stone vertically downward with an initial speed v0 from the roof of a building, a height h above the ground.
Part A: How long does it take the stone to reach the ground?
Part B: What is the speed of the stone at impact? Give your answers in terms of the given variables and g.
Any help would be greatly appreciated! Thank you so much!