InterviewSolution
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InterviewSolution
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A body is projected from the surface of the earth with thrice the escape velocity `(V_(e))` from the surface of the earth. What will be its velocity, when it will escape the gravitational pull?A. `2sqrt(2)V_(e)`B. `2V_(e)`C. `(V_(e))/(2)`D. `4V_(e)` |
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Answer» Correct Answer - A `(1)/(2)mV_(0)^(2)=(1)/(2)mV^(2)-(1)/(2)mV_(e)^(2)` `therefore V_(0)^(2)=(3V_(e))^(2)-V_(e)^(2)` `therefore V_(0)=sqrt(9V_(e)^(2)-V_(e)^(2))=sqrt(8V_(e)^(2))=2sqrt(2)V_(e)` |
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