Merry go round Rotation Problem

[KTiaam]

Homework Statement

A merry - go - round rotates clockwise 15 times in 45 seconds. By rubbing against its edge, a child stop it from turning in 15 seconds.

a) find its initial angular velocity (ω)
b) find its angular acceleration ($\alpha$)

The Attempt at a Solution

15 times in 45 seconds means:

in 1 second it makes 1/3 of a revolution

thus in 3 seconds it make on complete revolution

im not sure if I am going in the right direction but Angular Velocity is in radians per second.

Am i on the right track? Do i just take the reciprocal of my answer? Please help

 

[TSny]

You found that it makes 1/3 revolution per second. Can you convert 1/3 revolution to radians?

 

[KTiaam]

You found that it makes 1/3 revolution per second. Can you convert 1/3 revolution to radians?

2/3 pi radians?

 

[TSny]

Yes.