help me answer these questions:

Question 26 Cart X CartY ool A student must conduct an experiment to verify the conservation of momentum for a closed two-cart system. Cart X and cart Y travel toward each other and eventually collide, as shown in the figure. The student has determined the following procedure. Step 1: Measure the mass of cart X and cart Y with a balance. Step 2: Use a motion sensor to record data of the velocity of each cart before, during, and after the collision. Step 3: Use the data and Z'?O = E?f to determine if the right-hand side of the equation is equal to the left-hand side of the equation. Which of the following steps should the student add to the procedure so that the conservation of momentum can be experimentally verified? @ Conduct the experiment on a smooth, level surface. Attach adhesive strips to each cart so that they stick together after they collide. Ensure that the mass of each cart is the same. @ Ensure that the initial speed of each cart is the same. Question 27 Object X of mass 4 kg travels with a speed of 3 2+ toward object Y of mass 2 kg that is initially at rest. Object X then collides with and sticks to object Y. After the collision, object X and object Y remain stuck together. How much mechanical energy is converted into nonmechanical energy during the collision? 01 6J 9J 107