Question

An asteroid is moving directly towards the centre of the earth. When at a distance of ( is the radius of the earth) from the earth centre, it has a speed of . Neglecting the effect of the earths atmosphere, what will be the speed of the asteroid when it hits the surface of the earth (escape velocity from the earth is )? Give your answer to the nearest integer in kilometer/s _____

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Updated on : 2022-09-05
Solution
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Correct option is A)

Conserving energy between (1) and (2) of Earth and asteroid system


Given


Mass of earth

From above equation






 

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