somenody explain to me why for question 2 is the Fg positive 60 (down) when we chose up to be positive and down to be negative. Wouldn't fg then be -60n (down) or is fg never negative>
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No for force it is never like positive or negative for up and down it's simple you take force positive if acceleraton is in direction of the force applies the force of gravity pull the 60N force towards itself so positive.
Hope it helps pal☺☺
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