What’s the acceleration of a car that goes from 32 m/a to 96 m/s in 8.0 s

Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt.  This is:

a = Δv / Δt

a = (96 m/s - 32 m/s) / (8.0 s)

a = 64 m/s / 8 s

+15-35=-20

going in opposite directions