MCQOPTIONS
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MCQOPTIONS
| 1. |
A point P lies on the axis of a fixed ring of mass M and radius R, at a distance 2R from its centre O. A small particle starts from P and reaches O under gravitational attraction only. Its speed at O will be |
| A. | Zero |
| B. | \[\sqrt{\frac{2Gm}{R}}\] |
| C. | \[\sqrt{\frac{2Gm}{R}\left( \sqrt{5}-1 \right)}\] |
| D. | \[\sqrt{\frac{2Gm}{R}\left( 1-\frac{1}{\sqrt{5}} \right)}\] |
| Answer» E. | |