Question

A car with mass m traveling at speed v has kinetic energy k. what is the kinetic energy of a second car that has the same mass m and twice the speed of the first car? k 1.4 k 2 k 4 k

Answer 1

the kinetic energy of the second car would be D. 4k

Step-by-step explanation:

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Answer 2

Kinetic energy, KE, is modeled by the formula
`KE = (1)/(2)mv^2`, where m is the mass in kg and v is the velocity in m/s.

In this scenario, mass and one-half are constant but the velocity changes.

You can see that by squaring twice the velocity, that is equal to four times the original KE. Therefore, the answer is 4k.