Question

Escape velocity of an atmospheric particle which is 1000 km above the earth's surface, is (radius of earth is
6400 km and g = 9.8 m/s)
(1) 6.5 km/s
(2) 8 km/s
(3) 10 km/s
(4) 11.2 km/s​

Answer 1

I think answer is 672 km/s as per my calculation...but there's no such option

hope it helps u