Question

Two moving balls collide together. Determine the magnitude of their common final velocity. The first ball of mass o.5 kg and a velocity va = 3i+5j m/s. The second ball B has a mass of 1 kg and a velocity vb = 1.2i-j+1.8k m/s

Answer 1

total x momentum = .5*3 + 1*1.2 = 2.7
total y momentum = .5*5 + 1*1.8 = 4.3

sqrt (2.7^2+4.3^2) = 5.1 = mag of total momentum
mass = 1.5
so
v = 5.1/1.5 = 3.4 m/s