The figure shows a glancing (not head-on) collision between two billiard balls (viewed from above). Ball 1 is initially moving with 2.0 m/s in the positive x direction; ball 2 is initially moving with 1.0 m/s in the opposite direction. After the collision, ball 2 moves at 1.41 m/s in the negative y direction. a) What are the direction (the angle θ from the x axis) and speed of ball 1 after the collision? b) Is this an elastic collision? If not, what fraction of the original energy is lost in the collision?

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