11/12 please help

11. A 3.5kg toy cannon with wheels is loaded with a 52.7g ball. The cannon, * cart, and ball are moving forward with a speed of 1.27 m/s. The cannon is ignited and launches a 52.7g ball forward with a speed of 75 m/s. Determine the post-explosion velocity of the toy cannon. 0.16 m/s [Forwards] O 0.16 m/s [Backwards] 0.56 m/s [Forwards] 0.56 m/s [Backwards] 12. Two identical twins are running at speed (v) towards eachother. Both 2 twins have the same mass (m). What is the total kinetic energy and total momentum of this system? 0.5mv^2 2mv O my ^2 my Kinetic Energy O O O Momentum O O O