======Exploring Accelerated Motion======

Tossing ball above motion detector\\	

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- At rest or moving with constant velocity:  acceleration = 0 (Newton’s first law)\\
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Tossed ball: \\
- ball starts with high speed\\
- slows down as moves up\\
- as turns around velocity moves through zero but the ball does not stop\\
- speeds up as falls back down\\
*(acceleration is constant due to constant force on the ball by the Earth)\\
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Note that the sign of the acceleration is arbitrary; depends on decision of which is the positive direction:
  * if “up” is the positive direction, acceleration is negative throughout the motion – pull is always  ‘down’ toward the center of the earth)
  * if “down” is positive direction, acceleration is positive throughout the motion – pull is always ‘down’ toward the center of the earth)