A rocket is launched from point A on earth It reaches point B on earth with its velocity antiparallel to its initial velocity

Question

A rocket is launched from point A on earth It reaches point B on earth with its velocity antiparallel to its initial velocity The angle subtended by straight line joining AB at the centre is 20 0 60 If maximum height attained by the rocket is h km then is h 400 equal to Radius of earth R 6400 km G 20 B

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