The average force exerted on the car of mass 959 kg during eastward acceleration for 5 seconds is 3836 N
v = u + at
v = Final velocity
u = Initial velocity
a = Acceleration
t = Time
v = 20 m / s
u = 0
t = 5 s
20 = 0 + ( 5 a )
a = 20 / 5
a = 4 m / s²
F = m a
F = Force
m = Mass
m = 959 kg
F = 959 * 4
F = 3836 N
Therefore, the average force exerted on the car is 3836 N
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