Mathematics

A toy rocket is launched from a 3m
platform, at 8.1 m/s. The height of the
rocket is modelled by the equation
h= -4.9t^2 + 8.1t + 3, where h is the
height, in metres, above the ground
and t is the time, in seconds.
1. After how many seconds will the
rocket rise to a height of 6 m above
the ground? Round your answer to
the nearest hundredth.
2. When does the rocket fall again to a
height of 6 m above the ground?
3. Use your answers from parts a) and b)
to determine when the rocket reached
its maximum height above the ground.

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  1. plug in 6 for h

    use the quadratic formula to find the two answers
    ... one going up , the other coming down

    the average of the two is the time for max height

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