Your roommate is working on his bicycle and has the bikeupside down

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Your roommate is working on his bicycle and has the bikeupside down. He spins the 62.0 -diameter wheel, and you notice that a pebble stuck in thetread goes by three times every second.

What is the pebble's speed? and what is thepebbles acceleration? are the two questions I must answer. I haveno idea how to set up this problem.