The velocity of a car goes from 0 m/s to 60 m/s in a forward direction. what is the best explanation for this change?

when the speed was 0 m/s, the forces acting on the car were unbalanced. when the forces became balanced, the car started to move.

when the velocity was 0 m/s, all the forces acting on the car were balanced. the velocity changed because at least one unbalanced force is acting on the car.

when the inertia was constant, the speed was 0 m/s. the speed changed because the inertia of the car increased.

the force of gravity on all sides was equal at 0 m/s. the velocity of the car increased because the force of gravity on the back of the car increased.

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

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