Calculate the time taken for a mango fruit that fall from the tree 20 m to the ground [g = 10 ms-2]

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

Correct Option: Answer is D

u = , H = 20, g = 10

From equation of motion under gravity

H = ut ± 12gt2, It is falling so g is +ve

H = 0 + 12gt2

H = 12gt2

2H = gt2

2Hg = t2

t = 2H√g

= 2×20√10

= √4 = 2s

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