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Four smooth steel balls of equal mass at...

Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of 0.4 m/s . It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is

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In an elastic head on collision, of two equal masses their kinetic energies or velocities are exchanged. Hence when the first ball collides with the second ball at rest, the second ball attains thespeed of 0.4 m/s and the first ball comes to rest. This process continues. Thus the velocity of the last ball is `0.4 ms^(-1)`.
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