An artillery shell is moving on a parabolic trajectory when it explodes in midair. The shell shatters into a very large number of fragments. Which of the following statements is true (select all that apply)?
a) The force of the explosion will increase the momentum of the system of fragments, and so the momentum of the shell is not conserved during the explosion.
b) The force of the explosion is an internal force and thus cannot alter the total momentum of the system.
c)The center of mass of the system of fragments will continue to move on the initial parabolic trajectory until the last fragment touches the ground.
d) The center of mass of the system of fragments will continue to move on the initial parabolic trajectory until the first fragment touches the ground.
e) The center of mass of the system of fragments will have a trajectory that depends on the number of fragments and their velocities right after the explosion.
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