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It all depends on the initial velocity at which you fell, and whether air resistence is present, etc.
If you are simply in a state of free fall, your time to reach the ground would be
d=100m
v1=0
a=9.8 <- acceleration of gravity on earth
t=unknown
d = Vi*t + 1/2 a t^2
100m=0*t+1/2(9.8) *t^2
100m=4.9*t^2
sqrt:(100m/4.9)=t
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