A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table.The initially moving billiard ball deflects 30.0° from its original direction.What is the speed of the initially stationary billiard ball after the collision?

Question

Quizplus · Accepted Answer

In a perfectly elastic collision between two identical masses, the initially stationary ball will move at a speed equal to the initial speed of the moving ball times the sine of the deflection angle. Thus, the speed is 3.00 m/s * sin(30°) = 1.50 m/s.

A Billiard Ball Traveling at 3