Question

A
boulder
rolls
off
a
cliff
that
is
20
m
above
the
surface
of
a
lake
with
an
initially
horizontal
speed
v0.
What
minimum
initial
speed
must
it
have
to
land
on
the
plain?
Hint:
it
must
just
avoid
striking
the
dam
which
is
100
m
away
from
the
base
of
the
cliff,
as
shown
in
the
Iigure.
Neglect
the
size
of
the
boulder
and
neglect
air
resistance

Answer 1

Hint:
vo *
(time
of
flight)
must
exceed
100 m.
There
is
no
ligure.