27% helium and 71% hydrogen
An object in equilibrium has no NET force acting on it. It's acceleration is zero, meaning that it's moving in a straight line with constant speed (which may be zero).
Answer:

Explanation:
First, it is required to model the function that models the increasing force in the +x direction:


The equation is:

The impulse done by the engine is given by the following integral:

![Imp = 161.333\,\frac{N}{s^{2}}\cdot [(3.50\,s)^{3}-(2\,s)^{3}]](https://tex.z-dn.net/?f=Imp%20%3D%20161.333%5C%2C%5Cfrac%7BN%7D%7Bs%5E%7B2%7D%7D%5Ccdot%20%5B%283.50%5C%2Cs%29%5E%7B3%7D-%282%5C%2Cs%29%5E%7B3%7D%5D)

Erosion:
A.) Is the same as weathering
This process of physically separating a single phase mixture into several components would be termed simple distillation, I believe.
As it is mentioned that one is separating them based on their different boiling points.