A plank of mass 5 kg and length 3 meters is resting horizontally on two trestles P and Q which are a distance of 2.5 meter apart.When a student of mass 60 kg walks along the plank from one trestle to other, the plank sags.
Calculate the downward force exerted on each trestle when the student is a distance of 0.5 meters from the trestle
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