Question

Mrs. Vincents's science class launched a toy rocket from ground level with an initial upward velocity of 60 feet per
second. The height h of the rocket in feet above the ground after t seconds is modeled by the equation h=60t - 16t^2.
How long was the rocket in the air before it returned to the ground?

Answer 1

Answer:

3.75 seconds

Step-by-step explanation:

To find the time it hit the ground, we must find the roots of the equation.

Factoring:

Take out the common factor of -4

$-4(4t-15)=h$

Find the root with the zero product property.

$4t=15\\t=3.75$

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