Answer:
The coefficient of static friction between the box and floor is, μ = 0.061
Explanation:
Given data,
The mass of the box, m = 50 kg
The force exerted by the person, F = 50 N
The time period of motion, t = 10 s
The frictional force acting on the box, f = 30 N
The normal force on the box, η = mg
                           = 50 x 9.8
                           = 490 N
The coefficient of friction,
              μ = f/ η
                = 30 / 490
                = 0.061
Hence, the coefficient of static friction between the box and floor is, μ = 0.061
