Inelastic or elastic collision?

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bearhug
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A 4.0 kg firework is tossed onto a hockey rink. As it slides, it explodes into exactly two 2 kg pieces. There is an x-y coordinate system painted under the ice. One part of the exploded firework has velocity 3.0 m/s along the y direction. The other part has a velocity of 5.0 m/s at an angle of +30 degrees relative to the x-axis.
(a) What is the original speed of the firework on the ice (before the explosion)

My biggest question is that in order to solve this problem should I treat it as an inelastic collision or any collision for that matter? Since technically there is no collision, just an explosion.
 
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You need to decide what's conserved and what's not. What do you think?
 
I was thinking it was elastic.
 
seriously any help on this problem is appreciated.
 
Answer my question: What's conserved and what's not conserved?