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The "Ideal Mechanical advantage" (IMA) of given pulley is .
Ideal Mechanical advantage of a system is defined by the ratio of achieved or output force to the implied force. In the pulley system above, output force is the resistant force denoted by . The input force is analogous or equivalent to the effort applied i.e. .
Hence by dividing these two forces we calculate the IMA of the above mentioned pulley system which is .
We know that Distance = speed x time Let w be the time Brad spent walking. The time spent jogging will be 1 - w 6 = 5w + 9(1 - w) w = 0.75 hours Distance walked = 0.75 x 5 = 3.75 km