1. The problem statement, all variables and given/known data If the Kinetic energy of a given mass is to be doubled, its speed must be multiplied by? 2. Relevant equations KE= 1/2mv^2 3. The attempt at a solution I believe the answer is 4, but am not really sure. I figured that if the Kinetic energy should be doubled, then since the v(velocity) on the other hand is squared and the proportionality also seems to be direct then the answer is 2^2=4. Am I right?