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A ball is dropped from a height of 5 m, if it rebound upto height of 1.8 m, then the ratio of velocities of the ball after and before rebound is :

$\begin{array}{1 1} (1)\;\frac{3}{5} \\ (2)\; \frac{2}{5} \\ (3)\; \frac{1}{5} \\ (4)\; \frac{4}{5} \end{array}$

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