Physics
Grade-7
Easy

Question

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

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

hintHint:

3 KE

The correct answer is: 3 KE


    KE space equals space 1 half space mv squared
straight m to the power of straight prime space equals space 3 straight m
straight K straight E with dot on top to the power of apostrophe space equals space 1 half space straight m to the power of straight prime straight v squared
equals space 1 half space left parenthesis 3 straight m right parenthesis space straight v squared
equals 3 space open parentheses 1 half space mv squared close parentheses
    = 3 KE

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