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1.The speed skating record for women is held by Bonnie Blair, who completed a 500-m race in 39.1 s. What is the corresponding average speed? Give the answer in m/s and in km/h.
2. The driver of an automobile traveling at 80 km/h suddenly slams on the brakes and stops in 2.8 s. What is the average deceleration during braking? 
 3. The takeoff speed of a jetliner is 360 km/h. If the jetliner is to take off from a 2100 m long runway, what must be the (constant) acceleration along the runway?

4. The muzzle speed of a 22-caliber bullet fired from a rifle is 360 m/s. If there were no air resistance, how high would this bullet rise when fired straight up?