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September 30, 2014

September 30, 2014

Posted by **Sarah** on Wednesday, May 9, 2012 at 9:20pm.

A) calculate the athlete's velocity just before reaching the pad

B) calculate the constant force exerted on the pole vaulter due to the collision

- Physics -
**Damon**, Wednesday, May 9, 2012 at 9:47pmsame as the last problem but you need initial velocity to get initial momentum

v = Vi - g t

v = 0 - g t so t = v/g

h = Hi + Vi t - (1/2) g t^2

0 = 5 + 0 t - (g/2) t^2

0 = 5 - (g/2)(v^2/g^2)

10 = v^2/g

v^2 = 10 g = 98

or use energy

(1/2) m v^2 = m g h

v^2 = 2 g h = 10 g = 98

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