NASA launches a rocket at t= 0 seconds. Its height, in meters above sea-level, as an equation of time is given by h=- 4.9ť² +

Question

NASA launches a rocket at t= 0 seconds. Its height, in meters above sea-level, as an equation of time is given by  h=- 4.9ť² + 139t + 269.
How many seconds does it take for the rocket to reach its maximum height?

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