Diagram to right shows velocity-time graph for two masses R and S that collided elastically. Which o

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5.Work, Energy, Power and Collision

hard

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 $S.$

$I$ only

$II$ only

$I$ and $II$ only

$I, II$ and $III$

Solution

$(I)$ both of them moved in same direction as final velocity of both of them is positive.

$(II)$ Kinetic energy if function of $v^{2}$ and will be minimum at the instant when both are on same speed.

$(III)$ Momentum will be conserved, as in the graph $R$ drops less velocity as compared to rise in $S'$s velocity for same amount of momentum transferred so $R$ is heavier than $S.$

Standard 11

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Solution

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