Free-fall Physics problem! What is the total time
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Free-fall Physics problem! What is the total time

[From: ] [author: ] [Date: 11-05-07] [Hit: ]
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A high diver jumps vertically upward at 5 m/s. The diving board is 10 m above the water. How long after jumping does he hit the water? Use 10 m/s-squared for g.

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(2 x 5)/10 = 1 secs

v^2 = u^2 + 2gs = 5^2 + (2 x 10 x 10) = 225

sq-root(225) = v = 15 m/s

10/((5 + 15)/2) = t = 1 sec

total = 2 secs

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Time going up = t = initial velocity/ g
Height going up = h = g/2 x t^2

Distance going down = d = (10 + h)
Time going down = T = square root of (2d/g)
Total time = t + T

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