This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Weight of body = 500N
so normal force(N) = weight = 500N

it just slides when 200N force acts on it. Since on a rough surface a body just slides when it just overcomes the friction,
the friction force = 200N
⇒μN = 200
⇒μ = 200/N
⇒μ = 200/500 
μ = 0.4