# A wagon of mass 500 kg is travelling around a circular path of radius 200 m with study speed of 90 km/h. What is the angular momentum?

25 × 10^4\ "kg m"^2//"s"
Speed $\text{= 90 kmph" = 90 cancel"kmph" × 5/18 "m/s"/cancel"kmph" = "25 m/s}$
Angular momentum $\text{= mvr = 500 kg × 25 m/s × 200 m = 25" × 10^4\ "kg m"^2//"s}$