A 55.0 kg runner runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its center. The runner's velocity relative to the earth has magnitude 2.50 m/s. The turntable is rotating in the opposite direction with an angular velocity of magnitude 0.250 rad/s relative to the earth. The radius of the turntable is 3.50 m, and its moment of inertia about the axis of rotation is 85.0 kg⋅m2. Find the final angular velocity of the system if the runner comes to rest relative to the turntable.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

because growing process had stoped after 4-5 year

god i hope this !