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In the figures at the right are shown two systems: a cart moving back and forth on a spring and a swinging pendulum. The graph below can be used to show the back and forth displacement of both systems as a function of time as long as the pendulum is kept at a small angle. A. Three instants of time are marked on the graph: A, B, and C. Complete the table below by indicating the direction of the quantity for the two cases using one of the following symbols: L (Left), R (Right), U (Up), D (Down), 0 (Zero), or S (Some other direction – draw an arrow to indicate which). |

Cart | Pendulum | |

Velocity at A | ||

Velocity at C | ||

Acceleration at B | ||

Net force on m at B |

B. If you knew m, could you calculate the length of the pendulum, L? If yes, explain how. If no, explain why not.

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