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**23. A 2-kg mortar shell in a fireworks display rises from the ground to a height at which
it is moving directly upward at 10 m/s. At this instant, the shell explodes and splits into two
pieces. A 0.5-kg piece heads off northward and exactly horizontally at a speed of 20 m/s. What
is the velocity (magnitude and direction) of the second piece? What is the change in kinetic
energy during the explosion?

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