Ladder Sliding (Inst. Center)

vA = vC + vA/C = 0 + vA/C

vA = vA/C = w rA/C = w 40 cos q

w = vA / (40 cos q) = 1 / (40 cos q)

vB = vC + vB/C = 0 + vB/C

vB = vB/C = w rB/C = w 40 sin q

vB = (vA rB/C) / (40 cos q)

vB = (1. 40 sin q) / (40 cos q)

vB = tan q

Velocity of Point A

Velocity of Point B