[Mentor note: Thread moved from technical forums so no formatting template shown] Unfortunately, I'm completely lost with this question: 1. A particle is moving along the x-axis. Its position as a function of time is given as x=bt-ct^2 Derive an expression for the x- component of velocity. and Derive an expression for the x-component of the particle’s acceleration, ax. The equation that I have to begin with (I have to start with it and then change it into the answer) MUST be on this sheet: http://web.mst.edu/~vojtaa/engphys1/handouts/OSEs.pdf Unfortunately, I have no idea which one to use. Can somebody point me in the right direction?