A ball projected from ground vertically upward is atsame height at time t1and t2.The speed ofprojection of ball is \lbrack Neglect the effect of airresistance\rbrack (1)g(t2-t1) (2)g(t1+t2)/2 (3)g(t2-t1)/2 (4) g(t1+ t2)

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