ch09-p021 - 21. We use coordinates with +x horizontally...

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21. We use coordinates with + x horizontally toward the pitcher and + y upward. Angles are measured counterclockwise from the + x axis. Mass, velocity and momentum units are SI. Thus, the initial momentum can be written G p 0 4 5 215 =∠ ° . bg in magnitude-angle notation. (a) In magnitude-angle notation, the momentum change is (6.0 – 90°) – (4.5
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