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Homework Statement
A 2kg object moving 5m/s in the positive x direction has a one dimensional elastic collision with a 4kg object moving at 1m/s in the same direction. What is the resulting change in kinetic energy of the 4 kg object?
Homework Equations
K=1/2 m*v^2 m1v1+m2v2=(m1+m2)V
The Attempt at a Solution
after solving for V would i just plug that into the kinetic energy and subtract it from the original kinetic energy of the 4kg object?