An instrument-carrying projectile of mass m1 accidentally explodes at the top of its trajectory. the horizontal distance between launch point and the explosion is x0 . the projectile breaks into two pieces that fly apart horizontally. the larger piece, m3 , has three times the mass of the smaller piece, m2 . to the surprise of the scientist in charge, the smaller piece returns to earth at the launching station. neglect air resistance and effects due to the earth’s curvature. how far away, x3 f , from the original launching point does the larger piece land?