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Homework Statement
The motion of an electron is given by x(t)=pt^3 +qt^2 +r, with p = -1.9 m/s^3 , q = +1.3 m/s^2 , and r = +9.0 m.
What is the velocity at: a) t=0s b) t=1s c) t=2s d t=3s
Homework Equations
v=x/t
The Attempt at a Solution
I have tried plugging in the time to equal to t, in which for a) i got +9 b)8.4 c)-1 d)-30.6
At this point I'm not sure what to do, and I'm totally lost...