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A particle of mass 1kg is moving with a velocity of 20ms^-1 then its kinetic energy is ____(a) 200 J(b) 200 kgm^2s^-1(c) 200 kgm^-1s^-2(d) 200 kgm^-1s^-1I had been asked this question in a job interview.Enquiry is from Kinetic Energy topic in chapter Work, Energy and Power of Physics – Class 11

Answer»

Right CHOICE is (a) 200 J

The explanation is: Kinetic energy of a particle is GIVEN by 0.5*m*v^2 i.e. 0.5*1*20^2 = 200 J. Joules can also be written as kgm^-2s^-2.



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