SOLUTION: Use the function h(t)=−16t2+v0t+s to answer the question. A man is standing on a cliff above a beach. He throws a rock upward at a speed of 90 feet per second from a heigh

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Question 1031386: Use the function h(t)=−16t2+v0t+s to answer the question.
A man is standing on a cliff above a beach. He throws a rock upward at a speed of 90 feet per second from a height 120 feet above the beach. How long will it take until the rock lands on the​ beach?
The rock will land on the beach in?
​(Round to the nearest tenth as​ needed.)

Answer by ikleyn(52795) About Me  (Show Source):
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Use the function h(t)=−16t2+v0*t+s to answer the question.
A man is standing on a cliff above a beach. He throws a rock upward at a speed of 90 feet per second from a height 120 feet above the beach. How long will it take until the rock lands on the​ beach?
The rock will land on the beach in?
​(Round to the nearest tenth as​ needed.)
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Substitute  v0 = 90  and  s = 120  into the function h(t)  and solve an equation 

-16%2At%5E2+%2B+90%2At+%2B+120 = 0.

Use the quadratic formula.