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- 1.304×104 m/sec
- 13.04×104 m/sec
- 1.304×108 m/sec
- 1.304×102 m/sec

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Solution

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Sun mass Ms=1.99×1038

distance r=7.8×1011 all in SI system of units

the centripetal force (Mjv2/r) for revolution will be provided by the gravitational attraction GMjMs/r2

so equating both we get Mjv2/r=GMjMs/r2 which give us v=2√GMsr

after putting G=6.67×10−11Nm2/(Kg)2 and other values

we get v=1.3×108m/s

Option C is correct.

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