(a) can you neglect the force of gravity when solving for the horizontal distance traveled by the particle?

Yes, you can. Forces are vector quantities. It depends on the direction of your motion. The gravitational force only acts on the vertical direction component. However, you would still have to incorporate the forces both in the horizontal and vertical motion to determine the net force.

Gas is all around us which means that the atmosphere

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.