A20 kg wagon is pulled along the level ground by a rope, Physics

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A20 kg wagon is pulled along the level ground by a rope

A20 kg wagon is pulled along the level ground by a rope inclined at30 degrees above the horizontal. A friction force of 30 N opposesthe motion. How large is the pulling force if the wagon is moving with (a) constant speed, and (b) an acceleration of 0.4 m/s2?

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