A particle is projected from point A, that is at a distance 4R from the center of the earth, with speed vi in a direction making 30° with the line joining the center of the earth and point A, as shown. Find the speed vi if particle grazes the surface of the earth as shown in the figure. Consider gravitational interaction only between these two. (use 
= 6.4 x 10 7 m 2 s -2 )
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Conserving angular momentum w.r.t center of earth,
Conserving mechanical energy of the system,
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