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In a classic lecture demonstration (see C2-11 at the University of Maryland demo site) two billiard balls are driven down parallel tracks by a spring gun. One ball travels along a flat track, the other along a track with a dip. The apparatus is shown in the figure below.

Below are shown 6 graphs and 10 physical quantities. Identify which of the
graphs could match each physical quantity if the vertical axis were given the
correct scale. The time *t* = 0 occurs just after the balls have been pushed
by the spring. Choose the graphs that match each quantity a.-j. If none works,
write N. Each graph may be chosen as many times as you like. You may assume
friction can be neglected.

a. The kinetic energy of ball A | f. The total energy of ball B |

b. The potential energy of ball A | g. The velocity of ball A |

c. The kinetic energy of ball B | h. The velocity of ball B |

d. The potential energy of ball B | i. The position of ball A |

e. The total energy of ball A | j. The position of ball B. |

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