A fireworks rocket (m= 1.4-kg) is fired with a speed of 80 m/s at an angle of 60

Question

A fireworks rocket (m= 1.4-kg) is fired with a speed of 80 m/s at an angle of 60º above the horizontal. At the highest point of its trajectory, the projectile explodes into two fragments, one three-times heavier than the other. The two fragments hit the ground at the same time, and the heavier fragment is hurled backwards so it lands at the same point from which it was launched. (what speed will this have after the explosion?)

How much energy was converted from chemical energy during the explosion into kinetic energy?

Explanation / Answer

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