A rock is thrown vertically upward with a speed
of 17.0 m/s from the roof of a building that
is 40.0 m above the ground. Assume free fall.
A) In how many seconds after being thrown does the rock
strike the ground? Express your answer in seconds
t =
B) What is the speed of the rock just before it strikes the
ground? Express your answer in meters per second.
v ground =