# Statistics

a ball rolls off a table and falls 0.80 m to the floor, landing with a speed of 4.5 m/s.
1. What was the initial speed of the ball?
2. What initial speed must the ball have if it is
to land with a speed of 5.8 m/s?
3. What is the magnitude of the acceleration
of the ball just before it strikes the ground?

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