A railwagon moves at velocity v on a track toward three other railwagons at rest on the track All the wagons are identical and

Question

A railwagon moves at velocity v on a track toward three other railwagons at rest on the track All the wagons are identical and each stationary wagon is some distance from the others The moving wagon hits the first stationary wagon and locks onto it Then the two hit the second stationary wagon lock onto that one and so on When all four railwagons have locked onto one another what is the velocity vy of the four wagon train OAV 4V OBVES 1 2vJ OC 1 4 OD V 1 8V OE V 4 Reset Selection

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