1. The problem statement, all variables and given/known data A particle moves along the y axis according to y(t)=(3.5 m/s2)t2 - (9.0 m/s)t + 5.0 m. (a) What is the particle's velocity as a function of time? (b) What is the particle's acceleration at t=2.0 s? 3. The attempt at a solution I was wondering about b- I derived: dy/dt = (7 m/s2)t - 9.0 m/s for the velocity function and then dv/dt = 7 m/s2 for the acceleration function. So the acceleration is constant, right? I'm finding seemingly irrelevant questions make me paranoid.