[mahmoud khodary]

M = 145 kg F = 1700 N w = 18.6 N

M *a = F - W

a = F-W/M

W = M*g = 145*9.81 = 1422 N

a = 1700 - 1422 / 145

a = 1.92 m/s^2

R = m * a + w
or
R = m *( g + a

m = w / g

m = 18.6/9.81=1.9 kg

R = 1.9 *( 1.92 + 9.81

R = 22 N