Physics

Grade-7

Easy

Question

# What is the new kinetic energy of a body of mass m, moving at a velocity, v, when its velocity becomes 2v

- 4 KE
- 16 KE

Hint:

### The new kinetic energy of the object that has m mass and 2v velocity is 4 KE.

## The correct answer is: 4 KE

- Kinetic energy is directly proportional to mass and the square of its velocity.
- The kinetic energy can be written as KE= 1/2 mv
^{2}.
- If the mass is m and the velocity v becomes 2v, the new kinetic energy is 4 KE.

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