Asked by Sanzhar
An object of mass 540 gram has an initial velocity of -0.4i+0.6j m/s. It collides with and sticks to another object of mass 880 gram moving with an initial velocity of 7.8i+2.3j+1.3k m/s (here i, j, and k are unit vectors along the x-, y-, and z-axis respectively). Find the speed of the composite object.