z_mov 0[cm] ""
r_sph .2[cm] ""
rho_sph 100[kg/m^3] ""
u_in 2[m/s] ""
m_sph rho_sph*4/3*pi*r_sph^3 ""
z_disp 0[cm] ""
F_g_sph m_sph*g_const ""