20 N
Newtons third law states that any action (pulling the sled) has an equal and opposite reaction (the sled pulling back on you).
Think about pulling a sled on really slippery ice, you would pull yourself toward the sled just as much as the sled toward you.
You divide 120 from 950 and that's the number of hours, 7.9
VA and I will not do this if they don't want it and you are a little
From the gravity acceleration theorem due to a celestial body or planet, we have that the Force is given as

Where,
F = Strength
G = Universal acceleration constant
M = Mass of the planet
m = body mass
r = Distance between centers of gravity
The acceleration by gravity would be given under the relationship


Here the acceleration is independent of the mass of the body m. This is because the force itself depended on the mass of the object.
On the other hand, the acceleration of Newton's second law states that

Where the acceleration is inversely proportional to the mass but the Force does not depend explicitly on the mass of the object (Like the other case) and therefore the term of the mass must not necessarily be canceled but instead, considered.
A) Kilograms per cubic meter. Every other option either contains pounds or feet, which are both units of measurement from the standard system, not the metric system.