When a body is moving in circular path at a distance r from its center its velocity at any instant will be directed tangentially. This is what we call tangential velocity. It is calculated as follows:
Vt = r(ω)
where ω = 5 rev/s (2π rad / rev) = 31.42 rad / s
Vt = 0.24(31.42) = 7.5 m/s
