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Homework Statement
A 0.70 kg ball is moving horizontally with speed of 9.6 m/s when it strikes a vertical wall. The ball rebounds with speed of 1.3 m/s. What is the magnitude of the change in linear momentum of the ball?
Homework Equations
Dp = mv(f) - mv(i)
The Attempt at a Solution
I solved for mv(f) and mv(i). Solved for Dp which I got -5.81 which is wrong.