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Question

If the acceleration due to gravity on the surface of the earth is 9.8m/s2, what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth ?

A
4.9m/s2
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B
9.8m/s2
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C
19.8m/s2
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D
None of the above
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Solution

The correct option is A 4.9m/s2
gGMR2
So, gp=(MpMe×(ReRp)2)g
=2×(12)2g
=g2=4.9 m/s2

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