cpcc
posted by nat .
Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a θ = 45.0° angle relative to the forward motion of the boat. If the boat moves with constant velocity, find the resistive force vector F exerted by the water on the boat.

Well the force in the direction of motion each pulls with it 600cos45
so the pulling force is 2*600*cos45.
If the boat is not accelerating, the friction force should be equal to that.