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				| 1. | What is the minimum velocity required for an object of mass m to escape the gravitational pull of a planet of mass M and radius R from its surface? | 
| A. | [(G*M)/R]<sup>1/2</sup> | 
| B. | [(2*G*M)/R] <sup>2</sup> | 
| C. | [(G*M*m)/R]<sup>1/2</sup> | 
| D. | [(2*G*M)/R]<sup>1/2</sup> | 
| Answer» E. | |