5) How much work is done lifting a 445 N barbell a vertical distance of 0.75 m? Show how you got your answer for full credit. ll 6) What is the kinetic energy of the bullet described in problem 4 above? Show how you got the answer for full credit. ll 7) What is the gravitational potential energy of a 45 kg barbell a distance of 1.8 In above the ground? Show how you got the answer for full credit. ll