Question

# A satellite is orbiting the earth close to its surface. A particle is to be projected from the satellite to just escape from the earth. The escape speed from the earth is ${\nu }_{e}$. Its speed with respect to the satellite (a) will be less than ${\nu }_{e}$ (b) will be more than ${\nu }_{e}$ (c) will be equal to ${\nu }_{e}$ (d) will depend on the direction of projection.

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Solution

## (d) will depend on the direction of projection.For example a body projected vertically requires less escape velocity than a body projected at an angle with the vertical.

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