## What is the Speed?

**A 5.0-m-diameter merry-go-round is initially turning with a 4.5 seconds period.**

**What is the speed of a child on the rim?**

**Known variables:**

**diameter (d): **5.0 meters

**period (T): **4.5 seconds

**velocity (v)= **circumference / period

**Circumference (c)**** = π x d**

π x 5.0= 15.707 m

**v=c/T**

**v=** 15.707 m /4.5 s

**v= **3.5m/s

## Leave a reply