Motion of a System Consisting of a Rolling Cart, Pendulum, and Spring

A cart with variable mass rolls on a smooth surface. Attached to the cart is a pendulum with negligible mass. A ball of variable mass is attached to a spring with variable unstretched length and stiffness. The ball and spring are placed inside the pendulum. Set the variables and watch the motion!

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Developed from the teaching materials of Professor Peacock and Professor Gossard for Course 2.003 in the Department of Mechanical Engineering at MIT.
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