Define absolute zero in terms of the kinetic energy of particles

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

Can anybody me with this? ? (picture included.)

In the first law of thermodynamics, triangle e=q-w, what does q stand for