A shell of mass 20 kg moving horizontal at 4 m/s explodes into two parts. The part of mass 12 kg moves in the same direction as the shell with a velocity of 25 m/s. Find magnitude and direction of the other part.

Explanation

From principle conservation of mementum
`20xx4 = 12xx25+.08v`
Where is the velocity of the other part
8v=80-300=-220
or v = -22.5 m/s
-Ve sign indicates that 8 kg part is moving opposite to the parent shell.