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-<br />
m =80kg<br />
a =1m/s 2 -<br />
<br />
-<br />
<br />
<br />
<br />
<br />
a → <br />
<br />
F → = ma<br />
→<br />
F → c<br />
F → s <br />
→<br />
F w = F → c + F → s F w = F s − F c<br />
F s = F w + F c<br />
F s = ma + mg = m(a + g) = 880 N<br />
a<br />
F s<br />
F N<br />
F N<br />
=<br />
F s<br />
y<br />
<br />
F c<br />
F N F s<br />
-<br />
F N = 880 N,<br />
<br />
<br />
-<br />
<br />
F s = mg = 800 N<br />
<br />
a<br />
y<br />
<br />
<br />
<br />
<br />
<br />
-<br />
F → b = −ma<br />
→<br />
→<br />
F c + → F s + → F b = → 0 <br />
<br />
→<br />
F c + → F s − m → a = → 0<br />
F s − F b − F c =0<br />
F s = F b + F c = ma + mg = m(a + g) = 880 N<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
F b<br />
F s<br />
F c<br />
F N<br />
=<br />
<br />
131
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