A stone is dropped from a building and 2 seconds later another stone is dropped.How far apart are these two stones by the time the first one has reached at a speed of 30 m/s?(Take g = 10 m/s2)

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A stone is dropped from a building and 2 seconds later another stone is dropped.<br>How far apart are these two stones by the time the first one has reached at a speed of 30 m/s?<br>(Take g = 10 m/s<sup>2</sup>)