Question

Question #28e8a

Answer 1

The escape velocity is the one giving enough kinetic energy to balance gravitational energy exactly, so its total energy is zero
`1/2mv^2 = GMm/r`

Explanation:

`v=sqrt{2GM/r}`
`v=sqrt(2(6.67xx10^-11)(5.1xx10^24)/(57.0xx10^5))= 1.09xx10^4 m/s`