A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q. The surface has a frictional force acting during this motion. How much work was done by friction during this motion? The student calculates the value to be –Fdsin q. How does this value compare to the correct value? It is too low. The answer cannot be found until it is known whether q is greater than, less than, o

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