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An object is observed in a certain frame to have a four-momentum of [Pt,Px,Py,Pz] = [7.0 kg, 5.0 kg, 2, 2].

a) Find the object's x velocity in this frame.

b) Find the object's mass.

c) Find its kinetic energy in this frame.

d) Find its relativistic momentum in this frame.

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