1 . Aball is thrown vertically upwards at 19.6 m/s. For its complete trip (up and back down to the starting position), its average speed is: A. 19.6 m/s. B.9.8 m/s. C. 6.5 m/s. D.4.9 m/s.
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9.8 m/s
That is because the acceleration due to gravity is uniform. On the way up, it starts at 19.6 m/s and ends at 0 m/s, so its average is 9.8 m/s. The same is true in reverse for coming down.
Explanation:
For speed calculations the direction is not important and since acceleration is constant , then average speed = [19.6+0]/2 =9.8 m/s.
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