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A simple pendulum consists of a particle of mass m on an inextensible massless
string of length ?
The kinetic energy of the system in Cartesian coordinates is given by
T=m (x2
+ y?) where x and y may also be expressed in their polar coordinates
format as x { sin 0, and y = -l cos 0 respectively.

What can you conclude about the system from this equation of motion?

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