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The position of an electron is given by = 3.56t - 8.10t2 + 2.53, with t in seconds and in meters. At t = 1.22 s, what are (a) the x-component, (b) the y-component, (c) the magnitude, and (d) the angle relative to the positive direction of the x axis, of the electron's velocity ?

a) I got the answer to be 3.56 m/s

b) I thought was -8.10 m/s^2 but for some reason it is wrong or atleast this online homework is telling me it is

c) I used the magnitude function to find it for the time being 1.22s

sqrt(4.34^2 + (12.056)^2 + (2.53)^2) and I get 13.06m but it also tells me I am wrong with that.

d) then I can't find this out because I have the magnitude wrong. But if I did have it right I would have it to be arcCos(3.56/magnitude) right?

any help would be great thanks :)