Einstein?s energy?momentum relation for a particle of mass m with momentum p is?

Estimate the uncertainty in the x, y, and z components of the momentum of a quark confined in a (cubic) box of side length L = 1 fm using the Heisenberg uncertainty principle ?p_x,y,z & ?/L. Approximate 2> by (?p)², then show that for a quark of mass 5 MeV/c², E ? |p|c and that the zero-point energy of three quarks is of order 900 MeV, the rest energy of a proton.

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E = Vp?c² 2 2 + m²c4