Question: 3) A force acts on a certain object in such a way that when the object has moved a distance of r (in m), the

3) A force acts on a certain object in such a way that when the object has moved a distance of r (in m), the force f (in newtons) is given by f = 312+ 61 Find the work (in joules) done through the first four meters by evaluating (3r2 + 6r) dr

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