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OpenStudy (anonymous):
The equation for a projectile's height versus time is h(t)=-16t²+V₀t+h₀ 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. .......... 4.06 ........ ???
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