A 1.50 x 10^3 kg car traveling at 100 km/h South collides with a 1.20 x 10^3
kg car traveling North at 100 km/h. The heavier
car continues to move South after the collision,
but slows to 25.0 km/h. How fast is the lighter car
moving after the collision?

The vector a? is 3.50 cm long and is directed into this page. vector b? points from the lower-right corner of this page to the upper-left corner of this page and has the components bx=-19.5 cm , by=25 cm. in the right-handed coordinate system, where the +x-axis directed to the right, the +y-axis toward the top of the page, and +z-axis out of the page, find the x-component of the vector product a? ×b? , measured in cm2.