A body of mass 50kg lies on a rough horizontal flat form if a horizontal Force of 10n is applied to the body through it center of mass and slide the body on the body of the flat form find the co-officient of limiting friction between the body and the flat form

There are two

first is the coefficient of standing friction which is the one that holds the body still until it breaks loose. The second is the sliding coefficient that stops the acceleration and keeps constant speed,
You only provided data for one so
mu m g = 10 Newtons
mu (50)(9.81) = 10
mu = 10 / (50*9.81)
not a very rough surface