Physics
Grade-7
Easy

Question

Direction : What is the new kinetic energy of an object when its mass becomes
straight m over 4

  1. KE over 4
  2. KE over 8
  3. 4 KE
  4. 8 KE

Hint:

KE/4

The correct answer is: KE over 4


    KE space equals space 1 half space mv squared
straight m to the power of straight prime space equals space straight m over 4
KE to the power of straight prime space equals space 1 half space open parentheses straight m over 4 close parentheses space straight v squared
equals space 1 fourth space open parentheses 1 half space straight m squared close parentheses
equals space KE over 4

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