1. While traveling along a highway a driver slows from 24 m/sec to 15 m/sec in 12 seconds. What is the automobile’s acceleration? (Remember that a negative value indicates a slowing down or deceleration.)
2. A parachute on a racing dragster opens and changes the speed of the car from 85 m/sec to 45 m/sec in a period of 4.5 seconds. What is the acceleration of the dragster?
3. The cheetah, which is the fastest land mammal, can accelerate from 0.0 mi/hr to 70.0 mi/hr in 3.0 seconds.What is the acceleration of the cheetah? Give your answer in units of mph/sec.
4. The Lamborghini Diablo sports car can accelerate from 0.0 km/hr to 99.2 km/hr in 4.0 seconds. What is the acceleration of this car? Give your answer in units of kilometers per hour/sec.
5. Which has greater acceleration, the cheetah or the Lamborghini Diablo? (To figure this out, you must remember that there are 1.6 kilometers in 1 mile.) Be sure to show your calculations.
8. If a car can go from 0.0 to 60.0 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50.0 mi/hr?
9. A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/sec2. If the cart has a beginning speed of 2.0 m/sec, what is its final speed?
10. A helicopter’s speed increases from 25 m/sec to 60 m/sec in 5 seconds. What is the acceleration of this helicopter?
11. Below are three situations. In which is the acceleration most similar to the helicopters in question 10?
a. An object going from 0 m/sec to 25 m/sec in 5 seconds.
b. An object going from 0 m/sec to 7 m/sec in 2 seconds.
c. An object going from 5 km/h to 30 km/h in 1 second.
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