A ball is thrown down at 72 km h–1 speed from the top of a building. The
building is 125 metres tall. The distance travelled before it reach the
ground is as follows,
s = u0t + 1/2gtsquared
u0 = initial velocity (ms -1)
g = acceleration due to gravity (10 ms -2)
t = time (s)
Find the time for the ball to drop to fifth of the height of the building.
Find the time for the ball to reach the ground.