Benjamin threw a rock straight up from a cliff that was 60 ft above the water. If the height of the rock h, in feet, after t s

Question

3 years ago

9

econds is given by the equation h=-16t^2+68t+60, how long will it take for the rock to hit the water?

1 answer:

Darya [45] · Answer 1 · 2022-10-02T20:06:38+03:00

Darya [45]3 years ago

7 0

Answer:

5 sec

Step-by-step explanation:

Hit the water, means h = 0

Solve -16t^2 + 68t +60 =0

4t^2 - 17t - 15 = 0

(4t + 3)(t - 5) = 0

so t = 5 sec

Benjamin threw a rock straight up from a cliff that was 60 ft above the water. If the height of the rock​ h, in​ feet, after t s