First slide
Gravitaional potential energy
Question

A satellite is revolving round the earth with orbital speed V0.If it stops suddenly, the speed with which it will strike the surface of earth would be ( Ve= escape velocity of a particle on earth’s surface)

Moderate
Solution

 

Just before it strikes the surface of earth

12mv2+GMemR=Ei=GMemrV2=2GMeR2GMer=Ve22GMeGMe/V02V=Ve22V02

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