An exam paper contains the following equation for rocket propulsion:
)
The error in the equation is that,instead of (v + v_e) ,the velocity of the fuel relative to the ground should be

Question

An exam paper contains the following equation for rocket propulsion:

)
The error in the equation is that,instead of (v + v_e) ,the velocity of the fuel relative to the ground should be

Quizplus · Accepted Answer

The correct equation should be (v - v_e), as the velocity of the fuel relative to the ground should be subtracted from the velocity of the rocket. Option A is the opposite sign of the correct answer, option B adds the two velocities instead of subtracting them, option D subtracts the rocket velocity from the fuel velocity instead of the other way around, and option E multiplies the fuel velocity by 2 for no reason. Only option C correctly subtracts the fuel velocity from the rocket velocity.

An Exam Paper Contains the Following Equation for Rocket Propulsion