Physics
Grade-7
Easy

Question

What is the new kinetic energy of a body of mass m, moving at a velocity, v, when its velocity becomes 3 v

  1. 3KE
  2. 9KE
  3. fraction numerator K E over denominator 3 end fraction
  4. fraction numerator K E over denominator 9 end fraction

hintHint:

9 KE

The correct answer is: 9KE


    K E apostrophe space equals space 1 half space m v apostrophe squared
equals space 1 half m space left parenthesis 3 v right parenthesis squared space
equals space 9 left parenthesis 1 half space m v squared right parenthesis
equals space 9 space K E

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