Physics
posted by Tom .
A 0.15 kg baseball is thrown towards a batter with a velocity of 40 m/s. The batter hits the ball and returns it directly back with a velocity of 60 m/s.
What is the change in momentum of the ball?

Physics 
Damon
mass times change in velocity
.15 kg * 100 m/s
positive in direction of pitcher from batter 
Physics 
Teri
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