**a) **

Tangential speed, **v = rω = r2πf**

r = 62.0/2 = 31.0 cm

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

a) What is the pebble's speed?

b) What is the pebble's acceleration?

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