A tennis ball strikes a wall at 20m/s and rebounds at 15m/s. If the impact lasts 0.1s, what is the average deceleration?
We can calculate the average deceleration using the formula:
Given:
The initial velocity (the tennis ball's speed before hitting the wall).
The final velocity (since the ball rebounds, the direction is reversed, so it has a negative sign).
The time interval .
Now, calculate the change in velocity:
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