12. A cross -country race car driver sets out on a 1.00 hour , 100.0 km race . At the halfway marker (50.0 km ), the pit crew radios that the car had averaged a speed of only 80.0 km /h. a) How long did it take the driver to travel the first 50.0 km ? Show all work as demonstrated in the lessons b) How fast must the driver drive over the remaining distance in order to average 100.0 km /h for the entire race ? Show all work as demonstrated in the lessons 13. A car starts at rest and is moving at a velocity of 25 m/s after 18 seconds . How far will it have traveled ? Show all work as demonstrated in the lessons 14. A cat's displacement is 15 meters to the right in 7.0 seconds . If, at the start of the 7.0 seconds the cat was moving at a velocity of 2.0 m /s left what was its final velocity ? Show all work as demonstrated in the lessons 15. A bus traveling at 80 km /h accelerates for 12 s to a speed of 100 km /h. What was the acceleration ? Show all work as demonstrated in the lessons