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To answer this question you need to use the formula W=m*g. W is weight, m is mass(kg), and g is gravity. In normal physics gravity is 10 but to be more precise its 9.8. When you plug all the numbers in, and in your case, we get W=45*9.8. So the weight would be 441N. N is the symbol for Newtons, the unit of force.

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