a)
vi = 47.1 km/h
= 47.1*1000 m / 3600 s
= 13.08 m/s
vf = 83.9 km/h
= 83.9*1000 m / 3600 s
= 23.31 m/s
t = 3.9 s
use:
vf = vi + a*t
23.31 = 13.08 + a*3.9
a*3.9 = 10.23
a = 2.62 m/s^2
Answer: 2.62 m/s^2
b)
vi = 83.9 km/h
= 83.9*1000 m / 3600 s
= 23.31 m/s
a = 2.62 m/s^2
t = 2.0 s
use:
vf = vi + a*t
= 23.31 + 2.62*2.0
= 23.31 + 5.24
= 28.6 m/s
= 28.6*3600/1000 km/h
= 103 km/h
Answer: 103 km/h
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