Question: MFM3M1 NAME: DATE: PART B: APPLICATION. [10 marks] 5. A firecracker is fired from the platform. The height of the firecracker at given time id

MFM3M1 NAME: DATE: PART B: APPLICATION. [10 marks] 5. A firecracker is fired from the platform. The height of the firecracker at given time id modelled by the function h(t) = -5t2 + 10t +15 , where h(t) is the height in metres and t is time in seconds. a) Factor h(t) = -5t2 + lot +15 [2] b) Using the factored expression find the time when the firecracker hits the ground (hint: solve quadratic equations) c) At which height a firecracker will be after 2 sec ? ( Hint: substitute) [3] d) When will the fire tracked reach a height of 45m? (hint: solve quadratic equations) [3] e) What is the height of the platform? [2]

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