The drag force for falling objects due to air friction depends on the velocity of the object and is given by the equation [Fdrag = bv] where b is a constant that depends on the fluid through which the object moves and the radius of the object. (a) Find the terminal speed (in m/s) of an object of mass 54 kg for which  b = 17 kg/s. (b) Will the terminal speed be different if the object's initial speed is different? Yes or No?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”