Question

A 2.0 m diameter merry-go-round is initially turning with a 4.2 s period. It slows and stops in 22.0 seconds. Before slowing, what is the speed (in m/s) of a child on the rim?

How many revolutions does the merry-go-round make as it stops?

Answer 1

one rev in 4.2 seconds
v= 2PI*radius/4.2

figure that out

Now, average angular velocity= Vi/(2*r)

revolutions= avgangularveloicty*22sec

Answer 2

This is wrong