That's all the information I've got, so I don't really know what to do. But this is my idea: The equations of the motion are $ma=F_0\delta(t)-F_{friction}$$$ma=F_0\delta(t)-F_{friction}$$ and $\frac{2mR^2}{5} \frac{d \alpha}{d t}=F_{friction}R+\delta(t)F_0 r$,$$\frac{2mR^2}{5} \frac{d \alpha}{d t}=F_{friction}R+\delta(t)F_0 r,$$ where $R$ is the radius of the ball, $m$ is the mass of the ball and $r$ is the distance from the center of the ball to the hitting point. But I think I've done it wrong.