Final answer:
Without a specific velocity function or further details on the cyclist's motion, it is not possible to accurately calculate the cyclist's velocity at t=10s.
Step-by-step explanation:
The question pertains to calculating the velocity of a cyclist at a given time. It is important to note that several problem statements involving acceleration and velocity have been provided, but they do not directly answer the question regarding the cyclist's velocity at t=10s. For an accurate answer, we would need a specific velocity function or a description of the cyclist's motion up to that time. Since the given information does not provide such details, we are unable to calculate the cyclist's velocity at t=10s without additional context or information.