If a Proton with Mass 1

Multiple Choice

If a proton with mass 1.67 × 10−²⁷ kg moves in an accelerator such that its total energy is three times its rest energy,what is its speed? (c = 3.00 × 10⁸ m/s)

A) 2.83 × 10⁸ m/s
B) 2.45 × 10⁸ m/s
C) 2.00 × 10⁸ m/s
D) 1.00 × 10⁸ m/s
E) ​1.54 × 10⁸ m/s