A point on the rim of a 0.30-m-radius rotating

[debo]

A point on the rim of a 0.30-m-radius rotating wheel has a tangential speed of 4.0 m/s. What is the tangential speed of a point 0.20 m from the center of the same wheel?

a. 1.0 m/s
b. 1.3 m/s
c. 2.7 m/s
d. 8.0 m/s

i have been trying to do this for hours now.somebody please help

 

[CompuChip]

What formula do you know that relates tangential speed to radius?

 

[debo]

can anyone help me?

 

[CompuChip]

What formula do you know that relates tangential speed to radius?

https://www.physicsforums.com/showthread.php?t=94379. Then, you might want to answer that question. The solution immediately follows (i.e. I cannot make it any easier for you without giving the answer).