A uniform ladder weighing 253 N is leaning against a wall. The ladder slips when its angle between the horizontal and the wall is 56 degrees. If the coefficient of static friction at the wall and the ground are the same, obtain a value for µ. The acceleration of gravity is 9.8 m/s².
a) 0.6
b) 0.4
c) 0.8
d) 0.2