Question 7 (1 point) Which of the following statements about Work and Energy is correct for a system with purely conservative forces? OA) When the total workdone is positive, Total Mechanical Energy increases. OB) When the total workdone is positive, Kinetic Energy decreases. OC) Total Mechanical Energy is conserved only if the total workdone is zero. O D) When the total workdone is positive, Total Mechanical Energy decreases. OE) When the total workdone is positive, Kinetic Energy increases