Physics
Grade-7
Easy

Question

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

  1. 5 KE
  2. KE over 5
  3. 25 KE
  4. KE over 25

Hint:

5 KE

The correct answer is: 5 KE


    KE space equals space 1 half space mv squared
straight m to the power of straight prime space equals space 5 straight m
KE to the power of straight prime space equals space 1 half space straight m to the power of straight prime straight v squared
equals space 1 half space left parenthesis 5 straight m right parenthesis space straight v squared
equals space 5 space open parentheses 1 half space mv squared close parentheses
equals space 5 space KE

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