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Discussion Response Post to: plz help!!!!!!!!!

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Himanshu (9616)

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see

x + 1/2 at^2 <= vt (to catch him)

=> (a/2)t^2 - vt +x = 0

=> t = v +- (v^2 - 2ax)^1/2

hence for t to b real , v^2 >= 2ax

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