10) true or false: An object'sspeed is the magnitude of itsvelocity vector.

16) Expressed to the correct number of significant figures, (299.3 m)(0.0043 m) =

19) You're watching a car that is stopped at a traffic light, facing directlywest. When the light turns green, the car speeds up for 10 seconds. After that, the car continueswest at a constant speed for another 10 seconds before passing out of sight. which statement is true?

1. The cars acceleration vector pointed west during the first 10 seconds then east during the next 10 seconds
2. The cars acceleration vector pointed west during the first 10 seconds then there was no acceleration during the next 10 seconds
3. The cars acceleration vector pointed west during the entire 20 second interval
4. The cars acceleration vector pointed east during the entire 20 second interval