First sketch the problem. Then, draw the gravity vector of the wagon. You have to find the projection of the gravity vector onto inclined plane.
Calculate the force (in Newtons) required to push a 20kg wagon up a 0.5 radian inclined plane. One Newton (N) is equal to 1, and the force due to gravity on the wagon is , where is the mass of the wagon, and is the acceleration due to gravity (9.8). Please ignore friction in this problem.