A stone dropped from a building of height h
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A stone dropped from a building of height h and it reaches after t seconds on earth. From the same building if two stones are thrown( one upwards and one downwards ) with the same velocity u and they reach the earth surface after t1 and t3 seconds respectively , then
1) t= t1 - t2
2) t = t1+ t2 ÷2
3) t=√t1t2