A 75 kg shell is fired with an initial speed of 125 m/s at an angle of 55o above the horizontal.
Air resistance is negligible. At its highest point the shell explodes into two fragments, one four
times more massive than the other. The heavier fragment lands directly below the point of
the explosion. If the explosion exerts forces only in the horizontal direction, how far from the
launch point does the lighter fragment land?
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