From the word compound, the compound machine is already a combination of two or more types of simple machine. Thus, the answer is letter C. Because of its complexity, it is able to perform several other functions than a simple one.
P = m*v
7.5 = m*15
m = 7.5/15 = 0.5 kg
If the container explodes there is no pressure, becuase all your gas has escaped its container, there for, you ain’t got no gas
Force. Force is measured by newtons, probably because he came up with the equations to calculate force.
Hope this helps!