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Vo = 30 km/h = 8.33 m/s
Vf = 0
t = 4 s
a = ?
d = ?
Formula
d = Vo t + a t² / 2 =
d = Vf² - Vo / 2 a
a = Vf - Vo / t
a = - Vo / t = - 8.33 m/s / 4 s = - 2.0825 m/s²
d = Vo t + a t² / 2 = (8.33 m/s)(4 s) + ( - 2.0825 m/s²)(4 s)² / 2 =
d = 33.32 m - 16.66 m = 16.66 m