A stone (the system) with a mass of 1.0 kg is tied to the end of a light string which keeps it moving in a circle with a constant speed of 4.0 m/s on a perfectly smooth horizontal tabletop. The radius of the path is 0.60 m
How much work does the force exerted by the string do on the stone as it makes one-half of a complete circle? A) 100 J
B) 3.8 J
C) 0 J
D) 40 J
E) 80 J
C
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