Two cars, one with mass m1= kg and the other with mass
m2= kg crash in an intersection, as shown here.
Before the crash, car m1 was headed East with a speed v1i= m/s and
car m2 was headed North with a speed v2i= m/s.
After the crash, the cars stick together. What is the speed of the 2-car wreck
after the collision, and with what angle, 
, does it leave the crash point?