A rocket has a weight of $W$ and, as it rises vertically from the ground, has an initial acceleration of $a$. The acceleration of free fall is $g$. Which expression represents 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$Wa + W$