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Q.

A ball is dropped from a height of 90 m. What is its velocity just before touching the floor? (Take g = 10 ms^-1)

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a

$30 / \sqrt{2} {ms}^{- 1}$

b

900 ms^-1

c

$1800 {ms}^{- 1}$

d

$30 \sqrt{2} {ms}^{- 1}$

answer is B.

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A ball is dropped from a height of 90 m. What is its velocity just before touching the floor? (Take g = 10 ms-1)