Tina and her puppy are tugging on a rope, each pulling on opposite ends.When is Tina doing work?

Work is done when a force causes an object to move in the direction of that force. When Tina pulls the puppy toward her, she applies a force that moves the puppy toward her, so she does work. Holding the rope steady causes no movement, and once she lets go, she is no longer applying a force.

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