a 30 g ball, m1, collides perfectly elastically with a 20 g ball, m2. if the initial velocities are v1i= 50.0 cm/s to the right and v2i = -30.0 cm/s to the left, find the final velocities v1f and v2f. Compute the initial and final momenta. Compute the initial and final kinetic energies.
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