Two identical balls, each of mass m, are tied with a string and kept on a frictionless surface. Initially the string is slack. They are given velocities 2u and u in the same direction. Collision between the balls is perfectly elastic

After the first collision, what is the total loss in kinetic energy of the two balls system?

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$2 {mu}^{2}$

${mu}^{2}$

Zero

$3 {mu}^{2}$

answer is D.

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Detailed Solution

After the first collision the velocities are as shown in figure.

Balls are of same mass so during elastic collision velocities gets exchange.

In elastic collision, no loss of kinetic energy takes place.

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