B$.$ How massive a black hole do you want to fall into? Suppose $M=10$ kilometers $=10000$ meters, or about seven times the mass of our Sun. Assume your head and feet are $2$ meters apart. Find $r_{\text{o}\text{u}\text{c}\text{h}},$ in meters, at which you become uncomfortable according to our criterion. Compare this radius with that of Earth's radius, namely $6\mathrm{.}4{10}^6$ meters.

C$.$ Will your discomfort increase or decrease or stay the same as you continue to fall toward the center from this radius?

D$.$ Suppose you fall from rest at infinity. How fast are you going when you reach $r_{\text{o}\text{u}\text{c}\text{h}}$ according to Newton? Express this speed as a fraction of the speed of light.

E$.$ Take the speed in part D to be constant from that radius to the center and find the corresponding $($maximum$)$ time in meters to travel from $r_{\text{o}\text{u}\text{c}\text{h}}$ to the center, according to Newton. This will be the maximum Newtonian time lapse during which you will be er$-$uncomfortable.

F$.$ What is the maximum time of discomfort, according to Newton, expressed in seconds?