# physics

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A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?

• physics -

How long did it fly?
went 31 m at 22.3 m/s
t = 31/22.3 = 1.39 seconds

h = (1/2) g t^2
= 4.9 (1.39)^2
= 9.47 meters

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