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(D) $1$. Kinetic energy $(K = \frac{1}{2}mv^2)$ depends on the mass $(m)$ and the square of the speed $(v)$. Since the speed is constant,the kinetic e

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$II$ and $III$ only

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(D) $1$. Kinetic energy $(K = \frac{1}{2}mv^2)$ depends on the mass $(m)$ and the square of the speed $(v)$. Since the speed is constant,the kinetic energy remains constant throughout the motion.$2$. Gravitational potential energy $(U = mgh)$ depends on the height $(h)$ of the sphere. As the sphere moves in a vertical circle,its height changes continuously,so the potential energy changes.$3$. Momentum $(p = mv)$ is a vector quantity. Although the speed $(v)$ is constant,the direction of the velocity vector changes continuously as the sphere moves along the circular path. Therefore,the momentum changes.Conclusion: Quantities $II$ and $III$ change during the motion.

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