2. If the masses of the carts are equal in the elastic collision, what should happen to the carts after the KE, 1, and compare KE, collision? What happened in your experiment? Derive the expression for ratio, the theoretical values with your experimental result. 3. When a truck and a car are traveling with same speed make a head-on collision, is the force exerted by the car on the truck equal, greater or lesser than that exerted by the truck on the car? 4. Explain, using linear momentum, why a rifle must recoil in the opposite direction of the bullet when fired? 5. Verify that the units of 'Impulse' and 'Change in momentum' are essentially same.