Find the object's speeds v1, v2, and v3 at times t1=2.0s, t2=4.0s, and t3=13s.

The question is asking to calculate the object's speed v1, v2, v3 at the certain time is the given of the problem, in my calculation, I would say that the speed would be 2m/s, 1.5m/s, 0.22m/s. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification