Angular Momentum
In playground there is a small merrygoround of radius 1.25m and mass 175kg. Assume the merry goround to be a uniform disc. A child of mass 45kg runs at a speed of 3.0 m/s tangent to the rim of the merrygoround (initially at rest) and jumps on. If we neglect friction, what is the angular speed of the merrygoround after the child has jumped on and is standing at its outer rim?
A) 0.82 rad/s
B) 2.4 rad/s
C) 0.49 rad/s
D) 1.2 rad/s
E) 0.41 rad/s
