7.
A ball dropped from a point A falls down vertically to C, through the midpoint B. The descending time from A to B and that from A to C are in the ratio
(A) 1:1
(B) 1:2
(C) 1:3
(D) 1:2^-2
(E) 1 : 3^-2
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c part 1:3 is the correct answer
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