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

Kinetic energy, KE, is modeled by the formula $KE = \frac{1}{2}mv^2$, 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.

Answer 2

Answer:

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

Explanation:

took the test