(Solved): Exercise 5: A 1.00kg moves moves on a frictionless track to the right, toward a stationary 3.00 ...

Exercise 5: A $1.00\mathrm{kg}$ moves moves on a frictionless track to the right, toward a stationary $3.00\mathrm{kg}$ mass. It collides, and after the collision, the $1.00\mathrm{kg}$ mass is moving to the left at a speed of $0.800\mathrm{m}$ s and the $3.00-\mathrm{kg}$ mass moves to the right with a speed of $1.50\mathrm{m}\mathrm{s}$. a) What was the initial speed of the $1.00-\mathrm{kg}$ mass? b) What is the speed of the center of mass before the collision? c) What is its speed after the collision? (Whatever you say he d) How much energy was lost in this collision?