A steel ball is released from the roof of a building below as seen in the figure. The observer, standing in front of a 120cm tall window, observes that the ball passes in front of the window in 0.125 seconds. The ball continues to move and hits the ground and is seen again at the bottom of the window after 2 seconds in full flexibility. What is the height h of the building? (note: the magnitude of the velocity of the ball in fully elastic impact is equal to the magnitude of the velocity just before the impact) (g = 9.8m / s2)

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