1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution the particle is oscillating so we know at 1.5 seconds, it is at the equilibrium point , where speed is highest. (the speeds are 0 at the highest and lowest points of the graph.) we see that it goes from -6m to 6m, which is 12 meters in 1 second. so is the answer 12 meters per second? since that is the highest it can go?