Physics
Grade-7
Easy

Question

Direction : What is the new kinetic energy of an object of mass m when its mass becomes
straight m over 3

  1. KE over 3
  2. 3 KE
  3. KE over 9
  4. 9 KE

hintHint:

KE/3

The correct answer is: KE over 3


    kE space equals space 1 half space mv squared
straight m to the power of straight prime space equals space straight m over 3
KE to the power of straight prime equals space 1 half space straight m to the power of straight prime straight v squared
equals space 1 half space open parentheses straight m over 3 close parentheses space straight v squared
equals space 1 third space open parentheses 1 half space mv squared close parentheses
equals space 1 third space KE

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