Aperson is pulling on a block of mass m with a force equal to its weight directed 30 above the horizontal plane across a rough surface, generating a friction 'f' on the block. if the person is now pushing downward on the block with the same force 30 degrees above the horizontal plane across the same rough surface, what is the friction on the block?
a) f
b) 1.5f
c) 2f
d) 3f
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