The strength of Earth's gravity at ground level = 9.8 ng'l. 1 tonne = 1000 kg. Where forces are asked for, ensure that the direction is in the answer (e.g. upldown). Assume that the mass is evenly distributed in the rulers, poles, planks, bridge spans mentioned in the questions. A 200 [[1 bridge span is supported at both ends. The span weighs 100 tonnes. A 30 tonne bus is 50 m from one end of the span. Calculate the supporting force holding the bridge up at the end nearer the bus. Please give your answer to 2 significant figures