How Is Average Net Force Calculated on a Mercedes?

[JMurph]

Your 2000 kg Mercedes is accelerated from 10 m/s to 30 m/s in 4.75s. What is the average net force that you have applied to the car in that time interval?Givens are:
mass= 2000 kg
time= 4.75s
acceleration=(V_f-Vi)/t= (30m/s-10m/s)/4.75s= 4.21m/s²
F=m*a= 2000kg*4.21m/s²= 8420 N

Unidentified:
F_Net=?I'm completely stumped. Help is greatly appreciated!

 

[PhanthomJay]

It's F_net =ma. F_net =??