Q: The ratio of radii of earth to another planet is 2/3 and the ration of their mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the earth, with the same effort, the maximum height he can jump on the planet is
(a) 1 m
(b) 0.8 m
(c) 0.5 m
(d) 1.25
Ans: (b)