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Block #1 (4 kg) moves & collides with Block #2 (1 kg) with u2 = 9...

Block #1 (4 kg) moves & collides with Block #2 (1 kg) with u2 = 9 m/s /to the left. After the collision, Block #1 has v1 = 2.7 m/s /to the left and Block #2 has v2 = 7.8 m/s /to the right. By calculation, show whether or not the collision is perfectly elastic. NOTE: Use ONLY the two linear equations – no kinetic energy is allowed.

m1*u1 + m2*u2 = m1*v1 + m2*v2

           u1 + v1 = u2 + v2

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