A 900-Kg Car Traveling 30

Multiple Choice

A 900-kg car traveling 30.0° south of east at 12.0 m/s suddenly collides with a 750-kg car traveling north at 17.0 m/s.The cars stick together after colliding.What is the speed of the wreckage just after the collision?

A) 7.21 m/s
B) 12.2 m/s
C) 20.4 m/s
D) 25.0 m/s
E) 17.3 m/s