Problem: Your roommate is working on his bicycle and has the bike upside down. He spins the 60-cm-diameter wheel, and you notice that a pebble stuck in the tread goes by four times every second.
Part A: What are the pebble's speed and acceleration?
Speed (in m/s) =
Acceleration (in m/s2) =
Please show the work for the calculation so I can understand what I'm doing. Thanks!