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If the gravitational force between two objects were proportional to 1/R

If the gravitational force between two objects were proportional to 1/R (and not as 1/R2)  where R is separation between them, then a particle in circular orbit under such a force would have its orbital speed v proportional to

(a)   1/ R2                                          (b) R°

(c)  R1                                       (d)  1/R

Answer: b

(10)

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