In physics class, the speed of a piece was measured at different points in time, and the attached graph was drawn based on the measurement results.


From the graph, determine

a) the speed of the piece [[$ 1 $]] s after launch.

Answer: The speed was m/s.

b) at what point the speed of the piece was [[$ 5.5 $]] m/s.

Answer: The speed was [[$ 5.5 $]] m/s s after the launch.

c) the speed of the piece at [[$ 8 $]] s.

Answer: The speed at [[$ 8 $]] s was m/s.