The masses of five balls at rest and lyi...

The masses of five balls at rest and lying at equal distance in a straight line are in geometrical progression with ratio 2 and their coefficients of restitution are each 2/3 . If the first ball is started towards the second with velocity u, then the velocity communicated to `5^(th)` ball is

`5/9`u

`(5/9)^2` u

`(5/9)^3` u

`(5/9)^4` u

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