What is the linear speed of a 43 kg person if he takes 24 s to travel around a circle with a radius of 1.5 m? _ m/s

The distance around a circle ... often referred to as the circle's "circumference" ... is

C = (π) · (diameter)

But the diameter is (2 · radius), so the circumference is also

C = (2·π) · (radius) .

The 43kg person in the question is going around a circle with radius = 1.5 m, so the distance all around the circle is  

C = (2·π) · (radius)  = (2·π) · (1.5 m) = 9.42 meters .

Now, Speed = (distance covered) / (time to cover the distance), so his speed is

S = (9.42 meters) / (24 seconds)

S = 0.39 m/s .

Notice that we don't need to know his mass in order to calculate his speed.  In the calculations, we never actually needed to use the "43kg".  The answer would be the same no matter what his mass is.

What I AM curious about is why it's taking him 24 seconds to move a distance of only about 31 feet ? ?  Normal walking speed is about 3 mph, but our man is only moving a little slower than 0.9 mph !

newton's first law of motion

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.