The object represented by the graph is not in motion at a) 1 second

It's possible, but not definite, that the object is not in motion in the time interval from 5 seconds to 10 seconds.

This is a graph of displacement, not distance traveled. So if the object were, let's say, revolving around the starting point at a distance of 9 meters, from 5 to 10 seconds, it would produce the same graph.

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~