A smooth inclined plane is 6.00 m long. The top end of the plane is 1.50 m above the bottom end of the plane. A box, which has a mass of 35.7 kg, is pulled up the plane by a rope that is parallel to the plane. The force in the rope is 99.6 N. The initial speed of the box is 0. Calculate the speed of the box when the box is at the top of the plane.