The ball in Figure 5.13 has a mass of \(6 \mathrm{~kg}\) and is fixed to a rod having a negligible mass. Assume that the ball is released from rest when \(\theta=60^{\circ}\).

a. Determine the gravitational potential energy of the ball when \(\theta=60^{\circ}\) and \(30^{\circ}\). The datum is shown in Figure 5.13.

b. Determine the kinetic energy and the velocity of the ball when \(\theta=30^{\circ}\).

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1 m FIGURE 5.13 Problem 3. datum