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Class 9
Physics :-NCERT Solution - Work, Energy And Power

Page No 159:
Question 16:
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?


Answer:

Kinetic energy of an object of mass, m moving with a velocity, v is given by the expression,

To bring the object to rest,  amount of work is required to be done on the object.

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