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Question

An object is projected vertically upward with speed gR, where R is radius of earth and g is acceleration due to gravity on surface of earth, Find the maximum attained by it.

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Solution

v2u2=2as Taking down words as -ive
v=0u=gRS=?a=g
0(gR)2=2(g)(s)=gR=2gS
S:R/2

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