A 1400-kg cannon, which fires a 70.0-kg shell with a muzzle speed of
556 m/s, is set at an elevation angle of 39.0° above the
The cannon is mounted on frictionless rails, so that it recoils freely.
(a) What is the speed of the shell with respect to the Earth?
(b) At what angle with the ground is the shell projected?
(Hint: The horizontal component of the momentum of the system remains unchanged as the gun is fired.)