2.66. A particle of mass 4 moves in the force field defined by
F=-200(r)/(r^(3))
. (a) Show that the field is conservative and find the potential energy, (b) If a particle starts at
r=1
with speed 20 , what will be its speed at
r=2
? Aus. (a)
V=(200)/(r)
, (b)
15\sqrt(2)