Question

Can kinetic energy of a system change without applying external force on it

Answer 1

$\huge\Black {Answer}$

Yes, the kinetic energy of a body can be changed without the application of an external force.

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Answer 2

It's not possible to change KE of a body without applying an external force. Sometimes even applied force can't change KE if it is acting perpendicular to the direction of motion e. g. in uniform circular motion.