net force

[Pencil]

ugh I've got problems with newton again. >.<

On vacation, your 1500 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 2.00 m/s^2.
What force does the trailer exert on the car?

F=ma so: Force of car is 1.08 kN and Force of trailer is 3.0 kN. I thought it would be 1.08-3.0 but I was wrong. What do I need to do?

[ptabor]

You need to invoke newton's 3rd law: the law of equal and opposite action-reaction pairs.

[Pencil]

Got it. Thanks. 1.08 kN. I acually got it the first time, only typed it in wrong. omg this class is going to kill me. I'm sure to have another question with in the next 3 minutes....