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22 December, 09:56

A ball is thrown horizontally at 12.2 m/s from the roof of a building and lands 21.0 m from the base of the building. How high is the building?

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  1. 22 December, 10:10
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    S=v*t

    t=S/v

    h=g*t^2/2=g * (S/v) ^2/2=9,81 * (21/12,2) ^2/2 m = 14,53309 m ~ 14,5 m ~ 15 m
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