2nd part needs to be redone, I couldn't figure it out

12. [1.25/2 Points] DETAILS PREVIOUS ANSWERS HOLTPHYS06 6.P.049. MY NOTES ASK YOUR A 61.2 kg pole-vaulter falls from rest from a height of 4.9 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.25 s after landing on the pad. (a) Calculate the athlete's velocity just before reaching the pad. 9.8 m/s downward (b) Calculate the constant force exerted on the pole-vaulter due to the collision. 39.2 * N upward Submit