Q.

Work done by friction

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a

increases potential energy of body

b

decreases potential energy of body.

c

decreases kinetic energy of body

d

increases kinetic energy of body

answer is C.

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Detailed Solution

  • The frictional force is the force that opposes an object's motion when it starts to move.
  • The kinetic energy: it of an object is the result of its motion.
  • When a frictional force works in the opposite direction on an object, it is denoted as a negative force or negative work done.
  • As a result, the object loses kinetic energy, it is unable to move if it is at rest or resists further movement if it is already moving due to friction.
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Work done by friction