A comet of mass M travels around the Sun in a very large elliptical orbit. At closest approach, the comet is a distance R from the Sun and has a velocity v.
How fast is the comet moving at its farthest point from the Sun at a distance D away?
Zero.
Mv(D)/(R)
v(R)/(D)
Mv(R)/(D)
MvRD
vRD
v(D)/(R)
Zero.
Tries (0)/(3)