12. If (2a+1, 3) is the midpoint of the 1 point
line joining the points (1,4) and (9,2)
then the value of a is *
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Step-by-step explanation:
In addition to sliding, one can also move materials by rolling. The great advantage of rolling a body over sliding is that the friction in rolling may be two or more orders of magnitude lower than that in sliding.
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