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Quantative Reasoning College Freshman

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Using the formula y=-16t^2+vt+h help me with this word problem : A firework rocket is fired straight up into the air with an initial velocity of v=192ft/sec
From the top of an apartment building h=48ft off the ground. The firework will explode when it reaches the peak (maximum) of its vertical trajectory. At what will the firework explode & with what initial velocity should the firework be fired to explode at the height of 948 feet?

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