Looking at the velocity vs time graph, between points b and c on the graph, the object was 1. at rest
2. decelerating
3.accelerating
4. going a constant velocity

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.