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A tow truck of mass 1000kg is towing a car of mass 600kg and both are moving at a constant velocity of 60m/s. The total resistance to the motion is 4000N and half of this resistance acts on the car. What is the force exerted on the tow-truck by the car? (ans 2000N)

Steps taken.

Total mass = 1000 + 600 = 16000kg.

Since it is moving at constant velocity, a = 0

Hence Force = resistance force

16000a = 4000

a = 2.5 m/s2

Mass of car = 600 kg, ==> force by car = 600 x 2.5 = 1500N

Nett force on car = 1500 -2000 = -500 N

Mass of tow-truck = 1000kg ==> force by truck = 1500 x 2.5 = 2500N

Nett force on truck = 2500 - 2000 = 500N

I think I am wrong somewhere, but got confused and not sure where am I wrong?

Please help me..... thanks