The tractor-trailer unit is moving down the incline with a speed of 5 mi/hr when the driver brakes the tractor to a stop in a distance of 4 ft. estimate the percent increase n in the hitch-force compo

The tractor-trailer unit is moving down the incline with a speed of 5 mi/hr when the driver brakes the tractor to a stop in a distance of 4 ft. estimate the percent increase n in the hitch-force component which is parallel to the incline, compared with the force present at steady speed. the cart and its load combined weigh 500 lb. state any assumptions.