When a girl pulls a trolley, the trolley moves through a distance. The girl exerts a force on the trolley, and the trolley gets displaced. Therefore, work is done.
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When a girl pulls a trolley, the trolley moves through a distance. The girl exerts a force on the trolley, and the trolley gets displaced. Therefore, work is done.
When a girl pulls a trolley, the outcome is that the trolley moves in the direction of the applied force. The work done is a result of the force exerted by the girl causing the trolley’s displacement.