A small rubber ball is launched by a compressed-air cannon from ground level with an initial speed of 18.9 m/s directly upward. Choose upward as the positive direction in your analysis.
(a) How long does it take to reach the maximum height?
s
(b) How long does it take to reach the ground after it reaches its highest point?
s
(c) What is its velocity just before it hits the ground? (Indicate the direction with the sign of your answer.)
m/s