# physics

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Bill kicks a rock oﬀ the top of his apartment building. It strikes a window across the street 12 m away. The acceleration of gravity is 9.8 m/s^2. If the window is 16 m below the position where Bill contacted the rock, how long was it in the air?

• physics -

h = Vo*t + 0.5g*t^2 = 16
0 + 4.9t^2 = 16
t^2 = 3.27 s.

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