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Problem $16\mathrm{.}119-$ A ladder sliding out from bottom

A $52-$lb ladder rests against a wall when the bottom begins to slide out. The ladder is $36-$ft long and the coefficient of kinetic friction between the ladder and all surfaces is $0\mathrm{.}2.$ Take $=40.$

Problem $16\mathrm{.}119.$c $-$ Forces at each end of the ladder

Determine the forces at A and $B.$

The force at $A$ is $$ lb $4$

The force at $B$ is $lb$~~ $$