The stoplight had just changed and a 1,043 kg Cadillac had entered the intersection, heading north at 10 m/s, when it was struck by a 930 kg eastbound BMW. The cars stuck together and slid to a halt leaving skid marked angled 86 degrees north of east. How fast was the BMW going just before the impact?

The stoplight had just changed and a 1,043 kg Cadillac had entered the intersection, heading north at 10 m/s, when it was struck by a 930 kg eastbound BMW. The cars stuck together and slid to a halt leaving skid marked angled 86 degrees north of east. How fast was the BMW going just before the impact?