Alejandro Christensen

Mathematics

16 March, 01:59

A rock is thrown into the air from a bridge and falls to the water below. the height of the ball, h meters, relative to the water t seconds after being thrown is given by h = - 5t^2 + 20t + 15

a) determine the maximum height of the rock above water

b) how long does it take the rock to reach maximum height

c) after how many seconds does the rock hit the water

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