Can anyone help with this ??? A 220g ball falls vertically downward, hitting the floor with a speed of 2.4 m/s and rebounding upward with a speed of 1.8 m/s. A.) Find the magnitude of the change of the balls momentum (up=positive) i used p=mv; (.22kg)(1.8) = .396 as well as (220g)(1.8)=396 B.) Find the change in the magnitude of the balls momentum. (Neg. value=decrease in magnitude) Can anyone help on this 2 parts?