what is the angular velocity of the wheel at 15 s?

Hi, I have a question and I hope anyone could answer it:

(Figure 1) shows the angular position of a potter’s wheel. Part A What is the angular displacement of the wheel between t = 5 s and t = 15 s? Express your answer in radians.

Part B What is the angular velocity of the wheel at 15 s? Express your answer in radians per second.

Part C What is the maximum speed of a point on the outside of the wheel 15 cm from the axle? Express your answer with the appropriate units.

θ (rad) 75- 50 25 – 0 t (s) 0 5 10 15 20
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