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January 30, 2015

January 30, 2015

Posted by **David** on Tuesday, April 19, 2011 at 10:19am.

(10 marks).

Kind Regards

- Maths and Physics -
**bobpursley**, Tuesday, April 19, 2011 at 10:25amI wonder what leave the Earth means. If it means to escape the normally inevitable return to Earth, the normal way to find this is to Integrate the potenial energy from Earth to infintity. I am not certain you have had calculus.

NeededEnergy= INT GMe/r dr from r=re to infintity

then, having that number set

1/2 massprojectile*velocity^2 equal to it, and solve for velocity. this is often called "escape velocity"

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