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Question

An unmanned space probe is to be thrown with such a velocity that it does not return back to Earth. It should be thrown with:


  1. velocity > (2GM)1/2/ R necessarily

  2. a great velocity but nothing more can be said

  3. velocity = (2GM)1/2/R

  4. velocity ≥ (2GM/R)1/2


Solution

The correct option is D

velocity ≥ (2GM/R)1/2


An unmanned space probe should be thrown with velocity ≥ (2GM/R)1/2 so that it does not return back to earth.

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