the wooden plank resting between the buildings defects slightly when it supports the 50 kg boy. this deflection causes a triangular distribution of load at its ends, having maximum intensities Wa and...

the wooden plank resting between the buildings defects slightly when it supports the 50 kg boy. this deflection causes a triangular distribution of load at its ends, having maximum intensities Wa and Wb each measured in N/m, when the boy is standing 3m from one end as shown. neglect the mass of the plank