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Alex climbs to the top of a tall tree while his friend Gary waits on the...


Alex climbs to the top of a tall tree while his friend Gary waits on the ground below. Alex throws down a ball with an initial speed of 4.50 m/s from 56.0 m above the ground. The starting height of the ball thrown upward is 1.50 m above the ground. Ignore the effects of air resistance.

1)

At what speed must Gary throw a ball up in order for the two balls to cross paths 28.0 m above the ground? (Express your answer to three significant figures.)

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