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One is: a) Two boats pull a 75 kg water skier. If each boat pulls with 600 N and the skier travels at a constant V, what is the magnitude of the retarding force between the water and the skis? b) if each boat pulls with 700N, what is the magnitude of the skier's acceleration?

I am thinking that I need to resolve this into y and x components but I really have no idea?

Another is: a) a 65 kg water skier is pulled by a boat with a horizontal force 400 N due east with water drag of 300N. A gust of wind supplies another horizontal force of 50 N at an angle of 60 degrees north of east. What is the skierr's acceleration at that instant? b) what would be the skiers acceleration if the wind force were in the opposite direction to that in part a?

I am just as lost as on the first one for this as they are similar problems.

The last one is: a .2 kg ball is released from a height of 10m above the beach and it leaves an impression 5 cm deep, what is the average force acting on the ball by the sand?

I jsut have no idea where to go with any of these. I don't even care if I have the answers here, I would just as soon take some advice and tutorials on how to do force problems as the book provides minimal help, as does my instructor. Any help on any of these would help as I am completely frustrated.