[" sec "," n "" A stone is dropped in a ...

[" sec "," n "" A stone is dropped in a well which is "19.6m" deep.Echo "],[" sec "," Sound is heard after "2.06" sec (after dropping) then the "],[" ur second in air."," velocity of sound is "],[30m/s" ,then ",[" (a) "332.6m/sec," (b) "3267m/sec],[" (c) "300.4m/sec," (d) "290.5m/sec]]

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[" sec "," n "" A stone is dropped in a well which is "19.6m" deep.Echo "],[" sec "," Sound is heard after "2.06" sec (after dropping) then the "],[" ur second in air."," velocity of sound is "],[30m/s" ,then ",[" (a) "332.6m/sec," (b) "3267m/sec],[" (c) "300.4m/sec," (d) "290.5m/sec]]

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