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The equation y = -16t^2 - 18t + 405 describes the height (in feet) of a ball thrown downward at 18 feet per second from a height of 405 feet from the ground, as a function of time t, in seconds. In how many seconds will the ball hit the ground?

 Nov 24, 2019
 #1
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Simply set y = 0 (as the ground is at height 0) and solve the resulting quadratic equation for t.

 Nov 24, 2019
 #2
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The equation y = -16t^2 - 18t + 405 describes the height (in feet) of a ball thrown downward at 18 feet per second from a height of 405 feet from the ground, as a function of time t, in seconds. In how many seconds will the ball hit the ground?

laugh

 Nov 24, 2019

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