A 45.0 g arrow moving North at 134 m/s strikes a 1.50 kg bale of straw initially at rest. The arrow passes through the bale, leaving at 78.0 m/s. What is the velocity of the bale when the arrow leaves?
M1*V1 + M2*V2 = M1*V3 + M2*V4
0.045*134 + 1.5*0 = 0.045*78 + 1.5*V4
Solve for V4.