Distance of a fall from rest = (1/2) (g) (Time²)
75 m = (1/2) (9.8 m/s²) (Time²)
75 m = (4.9 m/s²) (Time²)
Divide each side by (4.9 m/s²):
Time² = (75 m) / (4.9 m/s²)
Time² = (15.3) (s²)
Square-root both sides:
Time = 3.91 seconds
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