A stone is projected vertically upward with a velocity of 20m/s .Two seconds later ,a second stone is similarly projected with the same velocity. when the two stones meet, the second one is rising at a velocity of 10m/s .Neglecting air resistance, calculate i) the length of time the second stone is in motion before they meet ii) the velocity of the first stone when they meet.[g=10m/s^2]
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20
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