Q1 of 26 Page 28

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If an object has 0 momentum, does it have kinetic energy? Explain your answer.

If an object has 0 momentum then its kinetic energy is also 0, i.e. it does not have kinetic energy

We know momentum of an object is given as


P = mv


Where P is the momentum of object of mass m moving with speed v


Now, P = 0


i.e. mv = 0


So, either mass of object is 0, or its velocity is 0, i.e. it is at rest.


Now object will have some mass let it be m, so its velocity is 0


v = 0


now kinetic energy of any object is given as



Where m is the mass of the object moving with velocity v


Putting v = 0 in the above equation we get kinetic energy as



So, we get kinetic energy of the object as 0 J , so it does not have kinetic energy if momentum of the object is 0


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