Physics - Gravitation Question with Solution | TestHub

An asteroid is moving directly towards the centre of the earth. When at a distance of$10R$($R$is the radius of the earth) from the centre of the earth, it has a speed of$12 \mathrm{km} {\mathrm{s}}^{-1}.$Neglecting the effect of earth's atmosphere, what will be the speed of the asteroid when it hits the surface of the earth (escape velocity from the earth is$11.2 \mathrm{k}\mathrm{m} {\mathrm{s}}^{-1})$? Give your answer to the nearest integer in$\mathrm{km} {\mathrm{s}}^{-1}$__________.