Write the correct number in each box. Write the exact value. 1. Three point-masses are on a number line as shown in the table. Mass (kg) 5 2 6 (a) The total mass of the three point-masses is (b) Position (m) -1 3 2 kg. The first moment of the three point-masses with respect to 0 on the number line is kg.m. (c) The center of mass of the three point-masses is at on the number line.

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