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Richard Gudoski
Interpret Quadratics in Context (Graphing Tech)
May 26, 1:54:23 AM
A tennis ball is dropped from a certain height. Its height in feet is given by $h(t)=-16 t^{2}+400$ where $t$ represents the time in seconds after launch. After how many seconds does the ball hit the ground?
Answer: seconds
attempt 1 out of 3

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Answer

$t = \boxed{5}$

Steps

Step 1 ：Set the height equation to 0: $0 = -16t^2 + 400$

Step 2 ：Solve for t: $t = \sqrt{\frac{400}{16}}$

Step 3 ：$t = \boxed{5}$