Respuesta :

Acceleration= change in velocity/ change in time.

60-40=20 m/s (change in speed)
Time= 8 seconds

20/8= 2.5
Acceleration= 2.5 m/s^2

Hope this helps! :)
mashteyman
The acceleration is the change in velocity. The kinematic formula that is used is a=Δv/Δt.
Δ- stands for change in velocity 
given: vi=40 m/s, vf=60 m/s, t= 8s
Δv= vf-vi= 60-40=20
a=20/8=2.5
a=2.5 m/s^2

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