Velocity (m/s) Block 1 Blocks 1 and 2 +4.0 Time (s) Block 2 Which of the followi

Question

Velocity (m/s) Block 1 Blocks 1 and 2 +4.0 Time (s) Block 2 Which of the following is true of the motion of the center of mass of the two-block system during the time shown? O The center of mass moves at a constant velocity of +1.0 m/s because there is no friction actin the system. o The center-of-mass velocity increases as the blocks get closer together, and then becomes constant after the collision. O The center-of-mass velocity starts out greater than +1.0 m/s but decreases to-10 m/s during collision because the collision is inelastic. O The center of mass does not move because the blocks are moving in opposite directions before the collision.

Explanation / Answer

Concept- Since, there is no any external force ( in our case, friction can be external force) acting on the system of mass,so, center of mass will not accelerate and its velocity of center of mass will be same before and after the collision.

Correct option - first

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