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An object of mass 5kg is projected with a velocity of 20m/s at an angle of

An object of mass 5kg is projected with a velocity of 20m/s at an angle of 60 to the horizontal. At the highest point of its path the projectile explodes and breaks up into two fragments of masses 1kg and 4kg. The fragments separate horizontally after the explosion. The explosion releases internal energy such that the kinetic energy of the system at the highest point is doubled. calculate the separation between the two fragments when they reach the ground(g=10m/s2).???

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