A body is projected vertically upward from A,the top of a tower.it reaches the ground in t1 second.if it is projected vertically downward with same velocity it reaches ground in t2 seconds.if it falls freely from A,the time taken is
a)t1+t2 b)t1-t2 c) 2t1+t2 d)√t1×t2
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d. √t1×t2 is the answer
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