Hi Sonia! I'm so sorry for the delayed response. For part (ii), we need to obtain the value of t when the object is not moving before we find the displacement (integrate v dt) and acceleration (dv/dt) with the value of t found.

In this chapter, we need to realise that differentiating displacement gives velocity and differentiating velocity gives acceleration. The reverse processes are integration.

We also need to be able to distinguish between displacement and distance, as there is a difference between the two terms. If you are taking Physics as well, you would probably have learnt the difference between these two terms.