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Homework Statement
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In this example, I know that I can define the horizontal contribution of kinetic energy to the ball as ##\frac{1}{2}m(\dot{x} + \dot{X})^2##.
In the following example,
Mass ##M_{x1}##'s horizontal contribution to KE is defined as ##\frac{1}{2}m(\dot{X} - \dot{x_1})^2##. Why is this? I have a hunch that it is due to the "origin" (##X## line) ##x_1## and ##x_2## originate from, though I can't exactly put my finger on the exact reason.
Assistance is greatly appreciated!
2. Homework Equations
The Attempt at a Solution
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