Two figure skaters are standing motionless on the rink when they push off each other. The first skater has a mass of 80 kg and a final velocity 3 m/s. If the second skater has a final velocity of -5.3 m/s, what is her mass?

Neutrons are the particles which are present in the nucleus of an atom. These have a neutral charge, means that the don't have a positive charge like proton or a negative charge like an electron, but these are far more dense than electrons and protons. Under normal reaction, neutron may seem to just exist, as usually electrons are the particles which forms bonds or breaks them.

However, Neutrons play an important role in the weight and Radioactive properties of a material. During radioactive decay, which occurs in radioactive elements, the nucleus of an atom breaks down and releases energy and matter, which is primarily due to the knocking out of a neutron. These knocked out neutrons forms the basis of the nuclear fission and fusion reactions.