Modelling Height above the ground of a spec on wheel with speed 6 m per second

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Q2. A bicycle has wheels with diameter 60 cm.
The bicycle moves along the road at a speed of 6 m/s.
a. The outside of the tire has a spec of paint on it. Determine an equation for the height, h meters, of the spec above the road as a function of time, t seconds. Assume the spec is at its lowest point (h = 0) when t = 0.
b. What is the height of the spec of paint when bicycle has travelled 55 m?

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