From the first to the fourth dot, the velocity is decreasing. Thus, the acceleration vector is pointing in the opposite direction relative to the velocity vector.
From the fourth to the eighth dot, the velocity is constant. But the arc is caused by centripetal acceleration.
Complete the motion diagram by adding acceleration vectors. Assume that the dots are numbered from the start point to the end point. Draw the acceleration vectors with their tails at the dots. The orientation of your vectors will be graded. The exact length of your vectors will not be graded.
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