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51. The acceleration due to gravity on a planet A is9 times the acceleration due to gravity on planetB. A man jumps to a height of 2 m on the surfaceof A. What is the height of jump by the sameperson on the planet B?(1) 2/9 m(3) 6 m(2) 18 m(4) 2/3 m52. Two spheres of masses m and M are situated inair and the gravitational force between them is F.The space around the masses is now filled with aliquid of specific gravity 3. The gravitational forcewill now be(1) 3F(3) F/3(2) F(4) F/953. Phe density of a newly discovered planet is twicethat of earth. The acceleration due to gravity at thesurface of the planet is equal to that at the surfaceof the earth. If the radius of the earth is R, thenthe radius of the planet would be(1) 2R(2) 4R(3) R(4) R

Answer»

51)v2- u2= 2ah,Suppose u is the max speed with which the person can jump.-u2= -2 g​A​hA= -2 gBhBso, gA/gB=hB/hA=9 or hB= 18m.

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