When a red giant completes helium fusion and collapses, it becomes a
protostar
red dwarf
white dwarf
neutron star
black hole

When a red giang complete helium fusion and collapses, it becomes a white dwarf. The correct option is C. White dwarf are very dense stars that are usually the size of a planet. It is a stellar core reminant which mainly made up of electron degenerated matters; its mass is comparable to that of the sun while its volume is comparable to that of the earth.

Answer the radiant sun;

The object's initial distance above the groundthe object's initial velocity