Q: A particle is projected from the surface of the earth with an initial speed of 4 km/s. The maximum height attained by the particle is (Given, radius of the earth = 6400 km, g = 9.8 ms-2)
(a) 935 km
(b) 935 km
(c) 735 km
(d) 1035 km
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Ans: (b)