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  4v

  1. 16 KE
  2. fraction numerator K E over denominator 16 end fraction space
  3. 4 KE
  4. fraction numerator K E over denominator 4 end fraction

hintHint:

If the velocity is becoming 4v, the kinetic energy is 16 KE.

The correct answer is: 16 KE


    • The kinetic energy of the body that has m mass and v velocity is 1/2 mv2 
    • The kinetic energy changes when the velocity becomes 4v.
    • K E to the power of 1 space equals space 1 half space m space left parenthesis 4 v right parenthesis squared space
equals space 16 space K E

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