3 s:
v = a * t
where v is the velocity, a is the acceleration (+3.1 m/s²), and t is the time (1.3 s).
v = (3.1 m/s²) * (1.3 s)
v = 4.03 m/s
So, her velocity at t = 1.3 s is $\boxed{4.03 \text{ m/s}}$.
(b) Since her acceleration drops to zero for the rest of
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