Question about relativity theory

[nufa19]

the total energy of a proton is 3 times it rest energy.
-find the proton's rest energy in eV
-what is the speed of the moving proton?
-what is the proton's momentum?
please help me..i don't know how to solve it

 

[tiny-tim]

welcome to pf!

hi nufa19! welcome to pf!

start by writing the equation that relates total energy and rest energy

(if you don't know it, look it up!)