Two iceboats like the one in Example 5.6 (Section 5.2) hold a race
on a frictionless horizontal lake (Fig. 6.14). The two iceboats have
masses m and 2m. The iceboats have identical sails, so the wind
exerts the same constant force F on each iceboat. They start from
rest and cross the finish line a distance s away. Which iceboat
crosses the finish line with greater kinetic energy?