The tractor$-$trailer unit is moving down the incline with a speed of $4\mathrm{.}9m\frac{i}{h}r$ when the driver brakes the tractor to a stop in a distance of

$5\mathrm{.}9$ 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 $530$ lb $.$ State any assumptions.

Answer: $n=$

i