A. 2sec
B. 3sec
C. 35sec
D. 2.4sec
Correct Answer:
Option A – 2sec
Explanation
Using the equation
S = ut + ½ gt²
H = s = 20m, t = ?
G =10m/s², u = 0m/s
20 = 0 × t × ½ × 10t²
20 = 5t²
i.e 5t² = 20
t² = 20/5 = 4
t = √4 = 2sec
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