Finding acceleration given tension on a ramp?

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To find the acceleration of a 40.0 kg wagon towed up an 18.5° incline with a tension of 140 N, the net force acting on the wagon must be calculated. The gravitational force component acting down the ramp is determined using the sine of the incline angle. The net force is the difference between the tension and the gravitational force component. Once the net force is known, acceleration can be found using Newton's second law. The final speed of the wagon after moving 80.0 m can then be calculated using kinematic equations, assuming it starts from rest.
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I have no idea how to solve this problem & I need help. Please!

5) A 40.0 kg wagon is towed up a hill inclined at 18.5° with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 140 N in it. Assume that the wagon starts from rest at the bottom of the hill and neglect friction. How fast is the wagon going after moving 80.0 m up the hill?
 
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