A person A is trying to keep his balance while on a sled B that is sliding down an icy inc...

A person A is trying to keep his balance while on a sled B that is sliding down an icy incline. The weights of A and B are WA = 181 lb and WB = 50 lb, respectively. Determine the minimum coefficient of static friction μs between A and B required for A not to slide with respect to B if θ = 23°. Friction between the sled and the incline is negligible.

Figure P3.96