Before Collision Object 1 Object 2 Vai V 21 After Collision Object 1 Object 2 Vif C O V 2f In an experiment, students use motion sensors to measure the speed of objects 1 and 2, of masses m, and m2, respectively, that collide head-on while moving along a smooth horizontal surface. Consider velocity to the right to be positive. All motion is along a straight line. The speeds of object 1 are v1; before the collision and v1 after the collision. The speeds of object 2 are v2; before the collision and vay after the collision. Before the collisions, object 1 is moving to the right and and object 2 is moving to the left. Both objects reverse their direction of motion during the collision, as shown. Which of the following expressions can be used to determine the magnitude of the impulse on object 1 ? A m2 (v2f - Uzi) B m1 (U2f - Uzi) C m2 (vig - vli) 2m Vli D