How would you convince somebody that the momentum of an isolated system is constant?
a. It is a law; thus, you do not need to convince anybody.
b. Use an example from a textbook to show that the sum of the initial and final velocities of the objects involved in a collision are the same.
c. Derive it from Newton’s second and third laws.
d. Use it to make predictions about a new experiment, and then compare the outcome to the prediction.
e. Both (c) and (d) will work.
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