A child pulls a 15-kg sled containing a 5.0-kg dog along a straight path on a horizontal surface. He exerts a force of 55 N on the sled at an angle of 20° above the horizontal, as shown in the figure above. The coefficient of friction between the sled and the surface is 0.22.
a. Calculate the normal force of the surface on the system.
b. Calculate the acceleration of the system.
c. Calculate the work done by the child's pulling force as the system moves a distance of 7.0 m

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can u do me a favor can u draw the diagram

sure

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