What if your backpack weighs 50 N you pull it across a table at a constant speed by exerting a force of 20 N to the right draw a free body diagram showing all four forces on the backpack state the str?

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What if your backpack weighs 50 N you pull it across a table at a constant speed by exerting a force of 20 N to the right draw a free body diagram showing all four forces on the backpack state the str?