Qualification > Math

need help in M1

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astarmathsandphysics:
Dont have it. Post the question.

Ghost Of Highbury:
A car of mass 1200 kg traveling along a horizontal road experiences a resistance to motion of magnitude 140N. The car is accelerating at 0.5 m/s^2.
A trailer of 800 kg is now attached to the car. when the car and trailer are traveling along the same road the resistance to motion on the trailer has magnitude 500N. the resistance on the car and the forward driving force are the same as before the trailer was attached. find the force in the towbar between the car and the trailer.

astarmathsandphysics:
F=ma for car initially
F-140=1200*0.5 so F=740
Now f=ma for car and trailer
740-140-T=1200a so 600-T=1200a
T-500=800a
Add these to get 100=2000a so a=100/2000=0.05
From the second equation T=500+800*0.05=540N

Ghost Of Highbury:
Ah, got it, thanks. I drew the diagram incorrectly

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