The problem statement, all variables and given/known data A 22.00 lead sphere is hanging from a hook by a thin wire 3.90 long, and is free to swing in a complete circle. Suddenly it is struck horizontally by a 4.50 steel dart that embeds itself in the lead sphere. What must be the minimum initial speed of the dart so that the combination makes a complete circular loop after the collision? The attempt at a solution I tried finding expression for tension. at bottom, T - mg = mv^2/r at top, T + mg = mv^2/r Then use conservation of momentum for perfectly inelastic collision. but i cant solve. Can someone help me pls? Thanks!!