'140 lb' presentation slideshows

Juan is sitting on a sled on the side of a hill inclined at 45 ,

Juan is sitting on a sled on the side of a hill inclined at 45 , with Rafaela holding Juan from sliding down the hill. The combined weight of Juan and the sled is 140 lb. What force is required for Rafaela to keep the sled from sliding down the hill?. Applications of Vector Projection

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