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A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose density and radius are, respectively, one-quarter and one-third that of planet A

(a)  1.5 m                                  (b)  15 m

(c)   18 m                                   (d)  28 m

Answer: c

(4)

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