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A stone is thrown from the top of a building upward at an angle of 30° to the horizontal and
with an initial speed of 20 m/s, as in the Figure. If the height of the building is 45 m,
(a) how long is the stone "in flight"?
(b) What is the speed of the stone just before it strikes the ground?
vo = 20 m/s
(0, 0)
130°
45 m.
(x, – 45)

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