A car starts from rest and experiences a constant acceleration of 5 m/s2 until it reaches a speed of 650 meters per second. How long does this process take?
What’s the unknown variable?
1. Final velocity
2. Distance
3. Acceleration
4. Initial velocity
5. Time

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.