g A spring is attached to a block with a mass of 2.51 kg. The block is set on a rough horizonal surface, and you pull horizontally on the other end of the spring, steadily increasing the force. As soon as the spring stretches 0.181 m beyond its equilibrium length, you notice the block starts to move. If the spring constant is 85.3 N/m, what is the coefficient of static friction between the block and the surface