How could you increase the sliding friction between the sled and track? how could you decrease it?
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Ответ:
Ответ:
Markup=New-Original
Markup%=Markup/Original*100
Markup=31-20
Markup=11
Then,
Markup%= 11/20*100
M%=0.55*100
M%=55%
Thus, the percent of change was, 55%.