$5.)$ Comet Halley moves about the Sun in an elliptical orbit, with its closest approach to the Sun being about $0\mathrm{.}590$ AU and its greatest distance $35\mathrm{.}0$ AU $(1AU=$ the Earth$-$Sun distance$).$ The by the Sun has the comet about the Sun is constant, and the gravitational force exerted its speed when it is farthest from the Sun? $(10$ points$)$