A rocket of weight $W$ rises vertically from the ground with an initial acceleration of $a$. Take the acceleration of free fall to be $g$. Which expression gives the initial upward force produced on the rocket by the engine?
- A$\frac{Wa}{g} + W$
- B$\frac{Wa}{g}$
- C$\frac{Wa}{g} - W$
- D$Wa + W$