We know that when force is perpendicular to displacement, then the work done by it is zero. If this is true, then why do the vegetable vendor (who pushes the cart by applying perpendicular force) feels tired?
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If a person pushes on a cart, the cart will accelerate in the same direction as the applied force. In this case, force and displacement are parallel to each other (not perpendicular). If I push a cart to the west, it will move to the west (not to the north).
When you say "pushes the cart by applying perpendicular force", what is the force perpendicular to? It is not clear what you mean here.
Bob
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