The value of the coefficient of friction is B. 0.4
How to find the value of the coefficient of friction?
According to Newton's second law of motion, the net force (F) acting on the body is equal to its mass (m) multiplied by its acceleration (a):
F = ma
In this case, the only force acting against the motion is the frictional force (f). Therefore:
f = ma = 10 kg * (-4 m/s ²)
= -40 N
Since the body is resting on the floor, the normal force is equal to the weight of the body: N = mg
= 10 kg * 9.81 m/s ²
= 98.1 N
Therefore, the coefficient of friction can be calculated as:
μ = f / N = -40 N / 98.1 N
= 0.408