I am asked this question "Compute the Power when both mass and velocity are changing in time. (First rewrite KE(t) showing the time dependence, then compute d(KE)/dt."

Classical Dynamics of Particles and Systems
5th Edition
ISBN:9780534408961
Author:Stephen T. Thornton, Jerry B. Marion
Publisher:Stephen T. Thornton, Jerry B. Marion
Chapter14: Special Theory Of Relativity
Section: Chapter Questions
Problem 14.39P
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I am asked this question "Compute the Power when both mass and velocity are changing in time. (First rewrite KE(t) showing the time dependence, then compute d(KE)/dt."

I can get this to the point where there are similarities between my equation and the power equation. What I have right now is (v^2)/2 + vma I am not sure what I did wrong but I think that it is in the first few steps.

What do I need to do to fix this problem?

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