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14-11-2017
Physics

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Calculate the height of an object that hit the ground in 9 seconds in free fall (Vi=0) (customary units).

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14-11-2017

d = (Vi)t - 4.9t²
where t = 9 and Vi = 0
d = 0 - 4.9(9)²
d = -396.9 m

"d" is displacement, So the negative just represents that the object reduced it's height. df - di = 0 - 396.9

di = 396.9 m

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