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The ratio of the distances travelled by a freely falling body in the 1st, 2nd, 3rd and 4th second:
Explanation
$Sn = u + a/2(2n - 1)$ S1:S2: S3: $S4 = (2 \times 1 - 1):(2 \times 2 - 1):(2 \times 3 - 1):(2 \times 4 - 1) = 1:3:5:7$