Billiard balls A and B, of equal mass, move at right angles and meet at the origin of an xy coordinate system as shown in Fig. 7-36. Initially ball A is moving along the y axis at + 2.0 m/s, and ball B is moving to the right along the x axis with speed + 3.7m/s. After the collision (assumed elastic), ball B is moving along the positive y axis (Fig. 7-36) with velocity v'B. What is the final direction of ball A, and what are the speeds of the two balls?

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+y Wв B) "в- 3.7 m/s +x VA = 2.0 m/s (A)