Answer:
See below
Step-by-step explanation:
A ) distance = 1/2 a t^2 <==== when starting from rest
20 = 1/2 (a) (3.5^2) shows a = 3.27 m/s^2
B) Velocity(at 3.5 s) = a t = 3.27 * 3.5 = 11.42 m/s
C) 3.5 seconds + 80 m / 11.42 m/s = 10.5 s
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