# physics

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A 85 kg pole-vaulter falls from rest from a height of 6.4 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.48 s after landing on the pad.
(a) Calculate the athlete's velocity just before reaching the pad.

m/s downward
(b) Calculate the constant force exerted on the pole-vaulter due to the collision.
N upward

• physics -

a. V^2 = 0 + 19.8*6.4 = 126.72
V = 11.26 m/s.

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