A horse is pulling a cart on a flat road. The cart accelerates and exerts a force of 850 N on the horse in the negative direction. Which statement describes the force exerted on the cart? A. The horse exerts a force of 850 N on the cart in the positive direction. B. The horse exerts a force of 850 N on the cart in the negative direction. C. The ground exerts a force of 850 N on the cart in the positive direction. D. The ground exerts a force of 850 N on the cart in the negative direction.​ i have no clue if this is physics