A playground carousel is rotating counterclockwise about its center on frictionl

Question

A playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this person begins with an angular speed of zero and ends up with a nonzero angular speed, which means that he underwent a counterclockwise angular acceleration. The carousel has a radius of 1.55 m, an initial angular speed of 3.46 rad/s, and a moment of inertia of 124 kg

Explanation / Answer

in this case, the angular momentum of the carousel will be conserved.
initial angular momentum = I=124x3.46=429.04

final angular momentum = (I + mr2) f=(124+48.6x1.552) f=240.761f

these two will be equal, so

f=429.04/240.761=1.782 rad/s

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