Question

If a toy rocket is launched vertically upward from ground level with an initial velocity of 128 ft per second, then its height h after t seconds is given by the equation h(t) = -16t ^2 + 128t. What is the height after 60 seconds?

Answer 1

C) 8 seconds

Explanation:

Answer 2

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Explanation:

t=60 is outside the domain of the function, which is t ∈ [0, 8].

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If you take the function and the time at face value, ...

... h(60) = -49920 . . . feet, more than 9.4 miles below ground level*

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*The deepest hole ever drilled into the Earth is 40,230 feet deep, so this is almost 2 miles deeper.