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Your roommate is working on his bicycle and has the bike upside

Customer Question

Your roommate is working on his bicycle and has the bike upside down. He spins the 60.0 -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second. What is the pebble's speed? What is the pebble's acceleration?

Speed = 180 inches per second =10.2 miles per hour = 16.45 km per hour

The acceleration the pebble is experiencing is the centrifugal force it is experiencing.

that force is equal to the pebble's mass times its velocity squared, then that figure divided by the radius of the wheel. You need to know the mass of the pebble.