Figure 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. The velocities of `R` and `S` were equal at the mid time of the collision.
iii. The mass of `R` was greater than mass of `S`.
Which of the following is true?

Options

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

Answer

D

Explanation

`0.8 m_(R ) = 0.2 m_(R) + m_(S) xx 1 implies m_(S ) implies 0.6 m_(R ) implies M_(S) < m_(R )`