question_answer

A stone is dropped from the top of a tall cliff and n seconds later another stone is thrown vertically downwards with velocity u. Then the second stone overtakes the first, below the top of cliff at a distance given by

A) \[\left( \frac{g}{2} \right){{\left[ n\frac{\left( \frac{gn}{2}-u \right)}{gn-u} \right]}^{2}}\]

B) \[\left( \frac{g}{2} \right){{\left[ n\frac{\left( gn-\frac{u}{2} \right)}{gn-u} \right]}^{2}}\]

C) \[\left( g \right){{\left[ \frac{\left( gn-u \right)}{gn-\left( u/2 \right)} \right]}^{2}}\]

D) \[\left( \frac{g}{5} \right){{\left[ \frac{gn-u}{gn-\left( u/2 \right)} \right]}^{2}}\]