Based on the information in the attached picture please answer these questions (PLEASE ANSWER I'LL GIVE BRAINLIEST) (a) Indicate whether the speed of the center of mass of the two-block system is either constant or not constant during the time interval from to , and explain why.

(b) Indicate whether the mechanical energy of the two-block system is either constant or not constant during the time interval from to , and explain why.

(b) Indicate whether the speed of the center of mass of the two-block system is either constant or not constant during the time interval from to , and explain why.

(d) Indicate whether the mechanical energy of the two-block system is either constant or not constant during the time interval from to , and explain why.