Answer:
C.) T = 1.20s
Step-by-step explanation:
From equation of motion,
S = ut + ½gt²
S = 7m
g = 9.8m/s²
U = 0m/s (since he starts from rest)
t = ?
S = ut + ½gt²
7 = 0 * t + ½ * 9.8 * t²
7 = 0 + 4.9t²
t² = 7 / 4.9
t² = 1.42857
t = √(1.42857)
t = 1.195s
t = 1.20s