Physics question: don't know how to start. Which formulas?

Question

A child sits 2 m from the center of a merry-go-round that is rotating at a constant

25rpm.

What is the child’s angular velocity in radians/sec?

What is the acceleration of the child?

If the child has a mass of 25 kg, what is the minimum force needed to keep

the child from flying off of the merry-go-round?

What is the child’s linear velocity?

How does the child’s angular velocity change if they move to a position 1 m

from the center?

Answer 1

angular velocity (ω)(rad/s) = linear velocity (v)(m/s) / radius (r)(m/rad)

in uniform circular motion, acceleration (a) = v²/r

Does that help you solve it?