10s
5s
4s
2s
Correct 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 = √2Hg
= √2×2010
= √4
= 2s
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