Find the velocity of the ball when it hits the ground. The ball is launched straight up from the top of a building with an initial speed of 20 m/s \text{20 m/s} from a height of 30 m \text{30 m} above the ground. The height (in meters) of the ball above the ground t t seconds after it is launched is given by h ( t ) = − 1.5 t 2 + 20 t + 30 h(t)=-1.5t^2+20t+30 . Round the answer to the nearest whole number.

Find the velocity of the ball when it hits the gro...

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