Here is the problem which I am struggling on, please help me!
Problem: Particle X has a speed of 0.810 c and a momentum of 5.09x10-19 kgm/s.
Part I: What is the mass of the particle?
Part II: What is the rest energy of the particle?
Part III: What is the kinetic energy of the particle?
Part IV: What is the total energy of the particle?
I need expert help to solve the above problem.