A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity.

What is the coefficient of friction for the surface?

To find the coefficient of friction for the surface, we can use the formula:

coefficient of friction = frictional force / normal force

In this case, the force required to push the block, 2 N, is equal to the force of friction acting against it. The normal force is equal to the weight of the block, which is 5.7 N.

Therefore, the coefficient of friction is calculated as:

coefficient of friction = 2 N / 5.7 N

Simplifying this equation, we have:

coefficient of friction ≈ 0.35