- #1
sharbie
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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