A child of mass m stands on the edge of a Merri-go-round of mass M that is initially at rest but can turn freely. The child is at the 6-o'clock position, with the y axis pointing towards the 12 o'clock position and the x axis pointing towards the 3 o'clock position. The child starts to walk along the perimeter of the Merri-go-round clockwise at a speed of v relative to the ground. As she walks forward the merri-go-round begins to turn. What is the merri-go-round's angular velocity

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

The answer is b hope this

Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³