# A small car with a mass of $0.8\; kg$ travels at constant speed on the inside of a track that is a vertical circle with a radius of $5.0\; m.$ If the normal force exerted by the track on the car when it is at the top of the track is $6.0\; N$, what is the normal force on the car when it is at the bottom of the track?
$\begin{array}{1 1} 21.7\;N \\ 25.8\;N \\ 2.7\;N \\3.6\;N \end{array}$