Distance in the 10th second

Using the same falling body, how far does it fall during the 10th second (i.e., between $t = 9 s$ and $t = 10 s$ )?

~4 minAnswer checked instantlydifference of squares

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. III. Variation, Examples III, No. 15 (part 2)

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).