Question 138 of 223

The initial velocity ${v}_{i}$ required to project a body vertically upward from the surface of the earth to reach a height of $10R$, where $R$ is the radius of the earth, may be described in terms of escape velocity ${v}_{e}$ such that ${v}_{i}=\sqrt{\dfrac{x}{y}}\times {v}_{e}$. The value of $x$ will be