A model rocket is launched from a raised platform at a speed of 144 feet per second. Its height in feet is given by h (t) = - 16t 2 + 144t + 20 (t = seconds after launch). After how many seconds does the object reach its maximum height? 20 seconds

6.5 seconds

2.25 seconds

4.5 seconds

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A model rocket is launched from a raised platform at a speed of 144 feet per second. Its height in feet is given by h (t) = - 16t 2 + 144t + 20 (t = seconds after launch). After how many seconds does the object reach its maximum height? 20 seconds6.5 seconds2.25 seconds4.5 seconds

A model rocket is launched from a raised platform at a speed of 144 feet per second. Its height in feet is given by h (t) = - 16t 2 + 144t + 20 (t = seconds after launch). After how many seconds does the object reach its maximum height? 20 seconds

6.5 seconds

2.25 seconds

4.5 seconds