A playground merry-go-round with a mass of 105 kg and a radius of 1.4m is rotating with an angular frequency of 0.42 rev/s. What is the magnitude of its angular velocity in radians per second, after 17kg child gets onto it by grabbing its outer edge?

12000j is work done

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

come closer and become far apart and become steam/gas

i don't understand. explain it clearly