In Four-bar chaim ABCD, link Ad is fixed, and the crank AB rotayes clockwise at a constant speed of 10 radians per second .Length of the links are AB=60 mm;BC=CD=70 mm; DA=120 mm. The angle DAB=60 degrees and both B and C lie on the same side of AD 2.1 Draw the displacement diagram of the mechanism taking link AD as horizontal

2.2Use the vector diagram yo calculate angular velocities(magnitude and direction) of BC and CD, and

2.3 angular acceleration of BC and CD

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Answereyespot

Ibelieve the correct answer is c