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OpenStudy (anonymous):
The equation for a projectile's height versus time is h(t)=-16t^2+Vot+ho A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 130 feet per second. After how many seconds does the ball attain its maximum height? Round to the nearest hundredth.
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OpenStudy (anonymous):
afr aprox 4 secs
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