Question

a ball is dropped forma height H. When it reaches the ground, its velocity is 40m/s. Find the height H

Answer 1

$\large{\implies{Answer}}$

$v {}^{2} - u {}^{2} = 2as \\ (40) {}^{2} - (0) {}^{2} = 2(9.8)(s) \\ 1600 = 19.6s \\ s = \frac{1600}{19.6} \\ s = 81m(approx)$

Answer 2

Answer:

answer is 81.6 m

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