physics

please help i cannot figure this out

A 0.27 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s.
Find the momentum of the ball of dough halfway to its maximum height on the way up.
and

A 61 kg pole-vaulter falls from rest from a height of 6.6 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.30 s after landing on the pad.
Calculate the athlete's velocity just before reaching the pad.
Calculate the constant force exerted on the pole-vaulter due to the collision.

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