before I took the derivative of the equation, I plugged in the mass, since it's a constant, as well as what "α" is, and I got that a=(1.27*10^-19)(x^-2). I took the derivative of it and got that velocity equals -1.27*10^-19(x^-1) on the integral of 5 to 8.00*10^-10 m. I got the answer to be...