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A roller coaster track is designed so that the car travels upside down on a certain portion of the track as shown in the figure below. What is the minimum speed the roller coaster can have without falling from the track? Assume the track has a radius of curvature of 20 m.

  • physics -

    The force of the centripetal acceleration must be greater than or equal to the force of gravity, or

    m * v^2 / r >= mg

    v^2 / 20 >= 9.8

    solve for v

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