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The function y = -16^2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take to hit the ground? Round to the nearest hundredth
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Feb 24, 2018
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The function y = -16^2 + 486 models the height y in feet of a stone t seconds after it is dropped from the edge of a vertical cliff. How long will it take to hit the ground? Round to the nearest hundredth of a second.
A.) 7.79 seconds
B.) 0.25 seconds
C.) 5.51 seconds
D.) 11.02
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Iman Akbari
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The function is
for example, at time t=2s , the height y of the stone is found as follows:
When the ball hits the ground, the height y, becomes 0.
So we solve:
Answer: C. 5.51 seconds
Beyhan Gul
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Feb 28, 2018
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Beyhan Gul
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