Question

The diagram to the right shows the velocity-time graph for two masses $R$ and $S$ that collided elastically. Which of the following statements is true?
(I) $R$ and $S$ moved in the same direction after the collision.
(II) Kinetic energy of the system $(R\&S)$ is minimum at $t=2$ milli sec.
(III) The mass of $R$ was greater than mass of $S$.

• A. I only
• B. II only
• C. I and II only
• D. I, II and III

Answer 1

Answer: (D)

(i) From graph final velocity of both body is positive.
(ii) $K.E.$ is minimum when velocity of each body becomes equal.
(iii) Magnitude of change in velocity of $R$ is less.