A projectile is fired vertically, and its height (in feet) after t seconds is given by s(t) = −15t2 + 60t + 13440. Step 1 of 3:  Find the maximum height of the projectile. Round your final answer to the nearest hundredth. ___ft Step 2 of 3:  At what time will the projectile hit the ground? Round your final answer to the nearest hundredth. ___seconds Step 3 of 3:  At what rate is the projectile falling when it hits the ground? Round your final answer to the nearest hundredth. ___ft/sec

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