Faraday's law

Faraday's law is

The induced current flows so that its magnetic effect opposes the change of flux that produced it.

If a loop of resistance $R$ has magnetic flux ${\Phi }_B=-kz$, then its induced current is $I=k\dot{z}/R$. When its magnetic force is $-kI$ in the vertical direction, its equation under gravity isso its downward terminal speed is $Rmg/k^2$.