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Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?
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Afrog sits on a lily pad in the middle of a pond. suddenly it makes a leap pushing off lily pad. what’s the action and reaction?
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Which simple machine is best used to split apart an object?...
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