The correct answer to this question is D, Becomes 16 times to that of the initial. To find kinetic energy, we would use the equation K = ½mu2. The initial velocity is u and based off the question, and the final speed becomes v = 4u. Knowing this information, we can fill in the equation, making it K' = ½m(4u)2 and solving that gives us 16, which is the answer. If the question were asking about potential energy, the correct answer would be C. Remains the same. This is because that type of power doesn't change and will be the same regardless of the velocity.