A stone is dropped from the top of a cliff of height h. ''n'' seconds later, a second stone is projected downwards from the same cliff with a vertically downward velocity u. Show that the two stones will reach the bottom of the cliff together, if
`8h(u-gn)^(2) = gn^(2)(2u - gn)^(2)`
what can you say about the limiting value of ''n'' ?

Answer

`[sqrt((2h)/(g))]`