On Earth's surface. a uniform beam has a length of 3.0 m and weighs 50 N. It is supported on a pivot situated 1.0 m from one ond. as shown in the figure. When a block W is hung from the end closer to the pivot. the beam is in equilibrium. Determine the mass of W. A. 25.0 kg B. 2.55 kg C. 10.2 kg D. 153 kg E. 5.10 kg