If a body of mass 1 kg falls on the earth from infinity, it attains velocity (v) and kinetic energy (k) on reaching the surface of earth. The values…

If a body of mass $\displaystyle 1$ kg falls on the earth from infinity, it attains velocity $\displaystyle (v)$ and kinetic energy $\displaystyle (k)$ on reaching the surface of earth. The values of $\displaystyle v$ and $\displaystyle k$ respectively are $\displaystyle \_\_\_\_$. (Take radius of earth to be $\displaystyle 6400$ km and $\displaystyle g=9.8 \mathrm{~m} / \mathrm{s}^2$ )