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18. A body is projected horizontally from the surface of the Earth (radius=R) with a velocity equal to n times the escape velocity. Neglect rotational effects of the earth. The maximum height attained by the body from the earth's surface is R/2. Then n must be (a) 10.6 (b) (13)/2 (c) 10.4 (d) 1/2 19. A tunnel is dug in the earth across one of its diameter. Two masses mand 2m are dropped from the two

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