1. The problem statement, all variables and given/known data An 10.0 kg ball, hanging from the ceiling by a light wire 125 cm long, is struck in an elastic collision by a 1.20 kg ball moving horizontally at 7.50 m/s just before the collision. Find the tension in the wire just after the collision. 2. Relevant equations M1V1o + M2V1o = M1V2f + M2V2f 3. The attempt at a solution (1.2 kg)(7.5 m/s) = (10 kg)(Vf) Vf = 0.9 m/s Fc = mV^2/R = (10 kg)(0.9^2)/(1.25 m) = 6.48 N Fc = T - mg 6.48 = T - (10 kg)(9.8) T = 104.48 N -- Book says it's incorrect, what am i doing wrong?