\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
A ball is thrown upwards. Its height is modelled by \(H(t) = -4.9t^2 + 19.6t + 1.5\).
  1. What is the initial height of the ball?
  2. At what time does the ball reach its maximum height?
  3. When does the ball hit the ground?

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