A stone is dropped from a 100 metre high tower. How long does it take to fall the first 50 metre and the second 50 metre?
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T1 =underroot 50*2/10 =underroot 10
T2 =underroot 100*2/10 - underroot 10 =underroot 20 -underroot 10
T2 =underroot 100*2/10 - underroot 10 =underroot 20 -underroot 10
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