Baking soda mixed with vinegar produces carbon dioxide and water. The best way to prove that no mass was lost during this
reaction is to
A
use equal masses of baking soda and vinegar
B determine the masses of all the substances before and after
the reaction
C
determine the mass of the carbon dioxide and water that is
produced
compare the mass of the vinegar and water to be certain
they are equal

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air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

i already answered it by 34/s