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velocity and acceleration

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4.) A car has an average speed of 80.0 km/h for one hour, then an average speed of 90.0 km/h for two hours during a three-hour trip What was the average speed for the three-hour trip?

5.) What is the acceleration of a car that moves from a speed of 5.0 m/s to a speed of 15m/s during a time of 6.0 s?

10.) An archer shoots an arrow straight up with an initial velocity magnitude of 199.0 m/s. After 5.00 s, the velocity is 51.0 m/s. At what rate is the arrow decelerated?

13.) You drop a rock from a cliff, and 5.00 s later you see it hit the ground. How high is the cliff?

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Physical Science
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4.) A car has an average speed of 80.0 km/h for one hour, then an average speed of 90.0 km/h for two hours during a three-hour trip What was the average speed for ...

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