Math

sorry I don't understand what you are asking

what is s?

Rom:

sorry I don't understand what you are asking

what is s?

The s stands for arc length and r for the size of the radius. I guess they are asking how many radians per second you can get from the info given. I don't get the question either =/

Ok I get it now.

If they want radians per second then the radius isn't needed.

If you are travelling 3pi/4 radians in 5 seconds you are travelling (3pi/4)/5 radians/s = 3pi/20 rad/s

If they wanted a linear speed then you would have to find the linear distance 3pi/4 radians is given a radius of 4km

D = (arc length in radians)*(radius) = 3pi/4 * 4km = 3pi km

v = D/t = 3pi/5 km/s