Mathematics, 04.05.2021 01:00 abby28734

A ball is thrown upward at a velocity of 15 meters per second from a height that is 20 meters above the ground. The heighth (in meters) of the ball at timet (in seconds) after it is thrown can be found by the formula below.
h = -5t2 + 15t + 20
Find the time when the ball is again 20 meters above the ground.

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