Question

A particle travels 15 times around a 10-cm radius circle in 42 seconds. What is the average speed (in m/s) of the particle?

=
I think I use the
v=(2pi*r)/T
equation? Right?

Answer 1

Not quite. Since it goes around 15 times in 42 seconds, you need to multiply (2pi*r)/T by 15 if T = 42 s.