The net force, F newtons, needed to push a block along a horizontal surface is directly proportional to the mass, m kg, of the block, when m = 70kg, F = 30 newtons
a. Find a equation connecting F and m
b. FInd the net force required to push a box that has mass of 140kg
c. Given that a net force of 90 newtons is required to push a box, find the mass of a box
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