Question on: JAMB Physics - 2017
Calculate the time taken for a mango fruit that fall from the tree 20 m to the ground [g = 10 ms-2]
A
10s
B
5s
C
4s
D
2s
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Correct Option: D
u = , H = 20, g = 10
From equation of motion under gravity
H = ut ± (\frac{1}{2})gt2, It is falling so g is +ve
H = 0 + (\frac{1}{2})gt2
H = (\frac{1}{2})gt2
2H = gt2
(\frac{2H}{g}) = t2
t = (\frac{\sqrt{2H}}{g})
= (\frac{\sqrt {2 \times 20}}{10})
= √4
= 2s
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