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- Kinetic energy is the energy of an object in motion. It is defined as
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- The units of energy are Nm or Joules.
- Work is defined as the dot product of a force and the distance through which it acts:
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- Since work is defined by a dot product, it is a scalar quantity. Another way of expressing equation (1) is
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- Since cos90¬° = 0, forces acting perpendicular to the motion do not affect the work.
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