Exploding Shell
Channel: James Rantschler
Date: 2018-03-16

Try the problem first:

A cannon fires a shell of mass 2M with muzzle velocity V.  When the shell reaches the apex of its trajectory at a height H, it explodes into two equally-sized fragments (of mass M).  

If one of the fragments stops in midair due to the explosion, how far from the launch point does the other fragment hit the ground?