Question

you throw your keys 5 m/s from a cliff 45 m high. how far should you look for your keys?

Answer 1

if it has thrown horizontally so range of searching would be 5*t
you can calculate t by descending time which you can calculate by equation
\[45=\frac{ 1 }{ 2 } \ gt ^{2}\] tand take +ve value of t.