<em>ma = F - Fтрения = F - mgM</em>
<em>ma + mgM = F</em>
<em>m (a + gM) =F</em>
<em>m = F / a + gM = 300 * 10³ / 0.10 + 10*0.05 = 500кН</em>
P = F / S ----------------> S = F / p
F - сила ( m * g = 2000 * 10 = 20000 H )
p - давление ( 200 кПа = 200000 Па )
S = 20000 / 200000 = 0,1 м²