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what is the work-enrgy theorem?
If the body''s speed increases, then the work done on the body is positive and we say its Kinetic Energy has increased. Whereas if the body''s speed decreases then it kinetic energy decreases and the change in kinetic energy DKE is negative. In this case the body does positive work on the system slowing it down or alternately the work done on the body is negative.
work done by a force is equals to the difference between final and initial kinetic energy.
work energy theorem states that the work done is equal to the difference in its energy.
W=E2-E1
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