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If the roller coaster track has a hill at the end that was equal in height to the original hill, would the marble make it all the way to the top?

Please explain it to me!

  • physics -

    not quite

    any energy lost to friction or air resistance would prevent it from having enough energy to make it back to the same height (unless it started with a big push)
    If not moving at start, total energy = potential energy = m g h
    if any energy is lost during the trip, it will not be able to muster m g h once it stops again if h is the original h

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