Consider the Fig 4.5 that shows a four bar mechanism,
Here,
Velocity at point B, VB = 1. AB = 0. BO
Or,
0 = 1. AB/ BO
Velocity at point C, VC = 2. CD = 0. CO
Or,
0 = 2. CD/ CO
Using the above two equations, we get the following ratio-
1/ 2 = CD/ AB . BO/ CO
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