Question

A horse pulls a barge down a canal. The horse pulls on the rope with a force of 7900 N at an angle of 18 degrees to the direction of motion of the barge, which is heading straigt along the canal. The mass of the barge is 9500kg and its acceleration is .12m/s^2. What are the a) magnitude and b) direction of the force on the barge from the water?

Would I use F=mg sin (theda)? How would I find the direction?



I would use the cosine function The direction has to be in the direction of the canal.