Derive an expression for kinetic energy of an object

cbse
cbse-class-9-science
work-and-energy

#1

Derive an expression for kinetic energy of an object.
If the velocity of an object is doubled. What will be change in its kinetic energy?
Answer:
Suppose a body of mass m is moving with velocity v. It is brought to rest by applying a retarding force F. Suppose it traverses a distance s before coming to rest.
Kinetic energy of body, KE = Work done by retarding force to stop it.
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