Perfectly inelastic collision (1D) (vf = (m1u1 + m2u2)/(m1+m2))

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vf = (m1u1 + m2u2)/(m1+m2)

What each symbol means

SymbolWhat it stands for
v_fCommon final velocity (m/s)
m_1,m_2Masses (kg)
u_1,u_2Initial velocities along line (m/s)

When to use this

Bodies stick; momentum conserved; kinetic energy not conserved (lost to deformation/heat).