Here is Canvas object wihch demonstrate the problem.
Task: find Vc

table

approach:

(1) From beam table, select simply supported beam with uniformly distributed load over entire span.

(2) Table gives formula for slope at support B.

(3) Since there is a roller at B, vB = 0.

(4) vC = θB × L/2.

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Simply supported beam – uniformly distributed load