A simple pendulum of mass \(m\) and length \(r\) is mounted on the flatcar, which has a constant horizontal acceleration \(a_{0}\) as shown. If the pendulum is released from rest relative to the flatcar at the position \(\theta=0\), determine the expression for the tension \(T\) in the supporting light rod for any value of \(\theta\). Also find \(T\) for \(\theta=\pi / 2\) and \(\theta=\pi\).

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r m