A rocket, with a total lift-off mass of $10000 \mathrm{~kg}$, moves vertically upward from rest under a constant gravitational acceleration of $9.81 \mathrm{~m} / \mathrm{s}^{2}$. The propellant mass of $8400 \mathrm{~kg}$ burns at a constant rate of $1200 \mathrm{~kg} / \mathrm{s}$. If the specific impulse of the rocket engine is $240 \mathrm{~s}$, neglecting drag, the burnout velocity in $\mathrm{m} / \mathrm{s}$ is

(A) 3933.7

(B) 4314.6

(C) 4245.9

(D) 4383.3

A rocket, with a total lift-off mass of $10000 \mathrm{~kg}$, moves vertically upward from rest under a constant gravitational acceleration of $9.81 \mathrm{~m} / \mathrm{s}^{2}$. The propellant mass of $8400 \mathrm{~kg}$ burns at a constant rate of $1200 \mathrm{~kg} / \mathrm{s}$. If the specific impulse of the rocket engine is $240 \mathrm{~s}$, neglecting drag, the burnout velocity in $\mathrm{m} / \mathrm{s}$ is

(A) 3933.7

(B) 4314.6

(C) 4245.9

(D) 4383.3

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