A ball starts from rest at point $X$ on a rough semicircular track. It is momentarily at rest at point $Y$. The gravitational potential energy of the ball at point $X$ is $E_X$. The gravitational potential energy of the ball at point $Y$ is $E_Y$. Which equation links the energy of the ball at point $X$ with its energy at point $Y$?
- A$E_X = E_Y + \text{work done against friction}$
- B$E_X = E_Y - \text{work done against friction}$
- C$E_X + E_Y = \text{work done against friction}$
- D$E_X + E_Y + \text{work done against friction} = 0$