Physics
Grade-7
Easy

Question

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

  1. 4 KE
  2. KE over 4
  3. 16 KE
  4. KE over 16

hintHint:

4 KE

The correct answer is: 4 KE


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

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