A ball is dropped from the top of a building whose height is $20 m$ . $T a k e g = 10 m / s^{2}$
a) Find the velocity of the ball just before hitting the ground

10 m / s

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5 m / s

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15 m / s

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20 m / s

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Solution

The correct option is D $20 m / s$
Given:
$a = 10 m / s^{2}$
$s = 20 m$

Using equations of motion:
$v^{2} = u^{2} + 2 a s$
$v^{2} = 0 + 2 \times 10 \times 20$
$v^{2} = 400$
$v = 20 m / s$

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