Three students discuss a simple experiment where someone gave a cart a
quick push and then let it move along the track on its own (before someone
else stopped it). They notice that their speed-time graph (shown above)
indicates that the cart was slowing down very gradually after the initial push,
and discuss why they think this was happening.

Do you agree with Daryl, Kristen, Samantha, or with none of them? Explain your thinking.