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P: 79
 Quote by sophiecentaur BTW, the Negative sign in the equation is because the direction of the restoring force is opposite to the direction in which the particle has been displaced (i.e. back where it came from). If you are not familiar with equations of motion then I am sure you will come across them before too long and things may get clearer.
So when the pendulum is coming back to equilibrium, it becomes positive because the particle is being displaced in the same direction as the restoring force?