In the arrangement of Fig. 9-21, billiard ball 1 moving at a speed of 2.2 m/s undergoes a glancing collision with identical billiard ball 2 that is at rest. After the collision, ball 2 moves at speed 1.1 m/s, at an angle of u2 ! 60#.What are (a) the magnitude and (b) the direction of the velocity of ball 1 after the collision? (c) Do the given data suggest the collision is elastic or inelastic?

Making Sense of the Universe: Chapter 3 4.1 Describing Motion: Examples from Daily Life How do we describe motion Terms used to describe motion: velocity, acceleration, and momentum. Speed – how far something will go in a certain amount of time. Velocity – the speed and direction of something. Acceleration – when there is a change in speed or direction. Acceleration...