1. Speed, since we know that [tex]s=\frac{d}{t}[/tex], where s is speed, d is distance and t is time
2. Velocity, for velocity you need to consider the direction and displacement gives the direction of travel.
3. 25 mph, because [tex]s=\frac{d}{t} =\frac{50}{2} =25mph[/tex]
4. 50 mph east, velocity unlike speed has direction.
5.Velocity, displacement gives the formula [tex] v=\frac{d}{t}[/tex] direction.
6. 0, the displacement is zero so velocity is zero
7. It decreases, speed is inversely proportional to time