The object starts to move in a straight line with uniform acceleration from static state, and the acceleration is 1 meter per square second. What is the displacement of the object in the second second second? The answer is 3M. Can I use the average velocity in the second second second? How can I not find it?

(1) Displacement in the second second second
s=½×1×2²-½×1×1² m=
(2) Displacement in the second second second
The velocity at the end of 1.5s
v=1×1.5 m/s=1.5 m/s
s=1.5×1 m=
(the speed in the middle of the second second second is equal to the average speed of the second second second)

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