A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of
If ball falls from height and bounces back up to height h2 then
Similarly if the velocity of ball before and after collision are v1 and v2 respectively then
So
i.e. fractional loss in velocity