Suppose the air cart to the left has a mass of .750kg and an initial speed of .455m/s. The cart to the right is initially at rest and has a mass of .275kg. Find the velocity of the center of mass. (a) before and (b) after the carts collide and stick together (c)Find to kinetic energy of the system before and after the collision. (a)((.750kg)(.455 m/s) +(.275kg)(0m/s))/(.750kg+ .275kg) = .332927 m/s (b)((.750kg)(.455 m/s) +(.275kg)(0m/s))/(.750kg+ .275kg) = .332927 m/s (c)ki= (1/2) (.750kg)(.455m/s)^2 + (1/2)(.275kg)(0)^2 = .077634 J i don't know how to get the kinetic energy of the system after the collision? can someone help me out?