Question

Ball A,with a mass of 1.75kg,moves with a velocity of 3.50 m/s. It collides with a stationary ball B, with a mass of 2.50kg. After the collision, ball A moves in a direction of 55° to the left of its original direction, while ball B moves in a direction 35° to the right of ball A's original direction. Calculate the velocity of each ball after the collision.
va cos55 + vb cos35 = 1.75*3.5
va sin55 = vb sin35

Solve the second eq for either variable, then plug it into the first eq. Voila.

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