1. A ball rolls off a table and falls 0.81 m to the floor, landing with a speed of 5.5 m/s.
(a) What is the acceleration of the ball just before it strikes the ground?
m/s2
(b) What was the initial speed of the ball?
m/s
(c) What initial speed must the ball have if it is to land with a speed of 6.3 m/s?
m/s