14. If the total energy of a moving particle of rest mass m is equal to 3 times of its rest energy, then the magnitude of the particle's relativistic momentum is ______. (A) mc (B) 2 mc (C) mc (D) 3 mc (E) 2mc

2. The first stage of a Saturn V space vehicle consumes fuel and oxidizer at the rate of 1.50 × 10⁴ kg/s, with an exhaust speed of 2.60 × 10³ m/s. What is the acceleration of the vehicle just as it vertically lifts off the launch pad on the Earth if the vehicle's initial mass is 3.00 × 10⁶ kg? (A) 7.40 m/s² (B) 5.37 m/s² (C) 3.20 m/s² (D) 1.48 m/s² (E) None of the above is correct.

14. If the total energy of a moving particle of rest mass m is equal to 3 times of its rest energy, then the magnitude of the particle's relativistic momentum is ______.
(A) mc
(B) 2 mc
(C) mc
(D) 3 mc
(E) 2mc

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