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Question

3. The figure below shows a person sitting on a plank that is placed on two trestles. The person weighs 45

kg and the plank weighs 30 kg.

a) Calculate all the forces acting on the plank. To solve the task, you had to make measurements in the

figure.

b) How heavy must a person be who sits at the other end of the plank for the plank to start rotating?

Fig: 1