Asked by Physics,help.

A tennis ball of 60g is dropped from a height of 2.0m,It rebounds but loses 25% of its kintic energy as thermal energy.Ignoring air resistance,calculate
Answered by drwls
incomplete question, repeated later
Answered by Ashley
a car had a negative accelerations of 5.6m/s^2 for 2.5 seconds. If the initial velocity of the car was 28m/s [E] (let east be positive), what was the car's final velocity?
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