4. A figure skater lifts his partner [mass 56 kg} above his head. The height that the skater is lifted is 1.7 m. It takes 1.2 s to lift her. a. What is the gravitational potential energy relative to the ice of the lifted skater at the end of the lift? [5 marks} b. How much power is he generating during the lift? {4 marks} 5. A 4.00 kgcanon ball is shot straight up. It leaves the muzzle of the canon at 49.12 mls . Assuming no air friction, what is the maximum height the canon ball reaches? [ 8 marks}