A toy rocket is shot into the air. Its height, in metres, after t seconds is given by  h(t) = –4.9t 2 + 8t + 1.2 Determine the height of the rocket after 3 s b) Determine the rate of change of the height of the rocket after 2 s and 4 s.  c) How long does it take the rocket to hit the ground?

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