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## Homework Statement

A batter hits a fastball that is travelling at -38 m/s,. The ball has a mass of 0.145 kg. The change in momentum in the ball is 13.1 kg.m/s. what is the balls final momentum?

B.) what is the final velocity of the baseball?

## Homework Equations

deltaP = Pf - Pi

P = mv

## The Attempt at a Solution

p initial = 0.145( -38.0) = -5.51 kg.m/s

so... 13.1 = Pf - (-5.51)

Pf = 13.1 - 5.51

= 7.59 kg.m/s

b.) Pf = mvf

7.59= 0.145vf

vf = 52.3 m/s

I thought this problem was pretty basic, but i got 0 out of 4 for it, what do you guys get for a solution?