Question

A diver dives from a cliff with a height of 144 feet. His height, h, in feet is given by the equation h=-16t^2+144, where t is the time in seconds the diver has fallen. How many seconds will it take for the diver to reach the water?

Answer 1

3

Explanation:

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Answer 2

3 seconds

Explanation:

You want to find the value of t that makes the height (h) equal to zero:

0 = -16t^2 +144

0 = t^2 -9 . . . . . . divide the equation by -16

9 = t^2 . . . . . . . . .add 9

3 = t . . . . . . . . . . .take the square root. Only the positive root is sensible in this scenario.

It will take the diver 3 seconds to reach the water.