A 1075 kg van, stopped at a traffic light, is hit directly in the rear by a 705 kg car traveling with a velocity of +2.06 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of the car?
vf1= ((m1-m2)/(m1+m2))(v1)
vf2= ((2m1)/(m1+m2))(v1)