1. The problem statement, all variables and given/known data Okay for some reason I guess I don't understand this problem. Here is the question: A 7.50kg shell at rest explodes into two fragments, one with a mass of 1.50kg and the other with a mass of 6.00kg. If the heavier fragment gains 100J of kinetic energy from the explosion, how much kinetic energy does the lighter one gain? 2. Relevant equations K = 1/2mv^2 3. The attempt at a solution I calculated the velocity with the above equation and then tried to find the kinetic energy of the smaller particle and got 25J. This is not correct and I have no idea why...any help is appreciated. Thanks.