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5 January, 16:17

He equation $y=-16t^2+22t+45$ describes the height (in feet) of a ball thrown upwards at $22$ feet per second from $45$ feet above the ground. Find the time (in seconds) when the ball will hit the ground. Express your answer as a common fraction.

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  1. 5 January, 16:32
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    The ball hits the ground when y = 0:-

    -16t^2 + 22t + 45 = 0

    we need to solve this for t

    t = 2 1/2 seconds
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