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Dear student,

consider a weight attached to a string and whirled in a circular motion. 

The force maintaining the object in its orbit is always perpendicular to the displacement of the object and thus no work is done by this force.

Note also that if an object moves at a constant velocity over a frictionless surface, no force acts on the object and thus no work is done in order to produce the displacement.

Hope this helps.

Thanking you

Regards

Team

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