A model rocket has a mass of
3.00 kg. It is fired so that when
it is 220 m above the ground it is
travelling vertically upward at
165 m/s. At that point its fuel runs
out so that the rest of its flight is
without power. Assume that the
effect of air friction is negligible
and that all potential energies are
measured from the ground.
(a) What is the mechanical energy
of the rocket, relative to the
ground, when it is 220 m above
the ground?
(b) When it reaches the highest point
on its trajectory, what will its
gravitational potential energy be?
(c) How far above the ground is the
rocket at its highest point?
(d) When it hits the ground, what
is its speed?
2 answers