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Using,s=ut+12gt2or d=0+12gt12Now the time taken by sound of splash to reach our ear will be (318−t1)sec=(3.125−t1)secThen d=352.8×(3.125−t1)or 12gt1=352.8×(3.125−t1)12×9.8×t1=352.8×(3.125−t1)Calculate t1 from the above and calculate d by using d=0+12gt12=12×9.8×t12
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