posted by Joe .
A 8.00 kg shell at rest explodes into two fragments, one with a mass of 2.00 kg and the other with a mass of 6.00 kg.
If the heavier fragment gains 130 J of kinetic energy from the explosion, how much kinetic energy does the lighter one gain?
You have to find the velocity of the heavier fragment, then its momentum. The lighter fragment will have opposite momentum, from which you can find its velocity.
2 piece shell have same kinetic energy u can find one piece velocity by apply 1/2m(v)2 rule
The lighter one will gain 130j also because from calculations it will move with a velocity 3 times that of the larger mass...