By what factor will the kinetic energy of a particle change if the speed is increased by a factor of 2? 4 8 2 2
Question
By what factor will the kinetic energy of a particle change if the speed is increased by a factor of 2?
Options:
- 4
- 8
- 2
- 2
Solution
The kinetic energy of a particle is given by the equation KE = 1/2 mv^2, where m is the mass of the particle and v is its velocity.
If the speed (v) is increased by a factor of 2, the new speed will be 2v.
Substituting this into the kinetic energy equation gives:
KE = 1/2 m (2v)^2 = 1/2 m * 4v^2 = 2mv^2
This is 4 times the original kinetic energy (1/2 mv^2).
So, the kinetic energy of the particle will increase by a factor of 4 if the speed is increased by a factor of 2.
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