Answer:
The friction coefficient is .
Explanation:
Given that,
Mass of first box = m
Mass of second box = 3m
Let the static friction force on the less massive box is .
Since the small box is not slide, they have the same acceleration.
We need to calculate the acceleration
Using balance equation
....(I)
....(II)
Adding both the equation
Put the value of a in equation (II)
We need to calculate the friction coefficient
Using formula of frictional force
Hence, The friction coefficient is .