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## Homework Statement

A stone is projected horizontally from the top of a vertical sea cliff 49m high, with a speed of 20ms^-1. Neglecting air resistance, calculate:

The time that it takes to reach the sea.

## Homework Equations

v² =u²+2as

t=v-u/a

t=d/s

## The Attempt at a Solution

I'm not sure whether i should be calculating v-final velocity via v² =u²+2as and using that to find t, ie. t=v-u/a

or simply

t=d/s

can anybody enlighten me please? thanks