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Mathematics 18 Online
OpenStudy (anonymous):

Can someone please help? The equation for a projectile's height versus time is h(t)=-16t^2+v^0t+h^o. A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 120 feet per second. What is the maximum height, in feet, the ball will attain? Round to the nearest whole foot.

OpenStudy (anonymous):

\[h(t) = -16t^2 + v_0 t + h_0\]In this question,\[v_0 = 120\]\[h_0 = 2\]

OpenStudy (anonymous):

thank you I was confused where to plug in the numbers. what about the (t) is there a certain thing you plug into it? p.s. sorry math isn't my best subject

OpenStudy (anonymous):

There's a calculus way to do this and then there's the non-calc way. Which one do you want?

OpenStudy (anonymous):

the easy way lol

OpenStudy (anonymous):

heh are you familiar with calculus?

OpenStudy (anonymous):

no this is a precalculus question :o

OpenStudy (anonymous):

ok.\[h(t) =-16t^2 +120t + 2\]

OpenStudy (anonymous):

Do you know what the vertex of a quadratic is?

OpenStudy (anonymous):

i got 3 but im not sure if .its the answer

OpenStudy (anonymous):

hmm can you calculate the vertex?

OpenStudy (anonymous):

no lol

OpenStudy (anonymous):

what did u get?

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