ch02-p019 - 19. We represent its initial direction of...

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2 avg ( 30 m/s) ( 1m/s) 20 m/s 2.4 s a −− + == which indicates that the average acceleration has magnitude 20 m/s 2 and is in the opposite direction to the particle’s initial velocity. 19. We represent its initial direction of motion as the +
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