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A ball dropped from the top of a building hits the ground 4.0 s later. How high is the building (in meters)?
A ball dropped from the top of a building hits the ground 4.0 s later. How high is the building (in meters)?
use the following equation:
d = vi*t + 0.5*a*t^2
vi is the initial velocity which is equals to 0 if it is dropped from rest.
a is the acceleration due to gravity.
Therefore, d = 0.5(9.8)(4^2) = 78.4 meters.
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