52. A car starts from rest and accelerates to a speed of 60 mph in 12 sec. It travels 60 mph for 1 min and then decelerates for 20 sec until it comes to rest. The speed of the car s(t) (in mph) at a time t (in sec) after the car begins motion can be modeled by: for 0sts 12 12 s(t) = 60 for 12 < ts 72 3 (92 – t) for 72 < t< 92 20 Determine the speed of the car 6 sec, 12 sec, 45 sec, and 80 sec after the car begins motion.

52. A car starts from rest and accelerates to a speed of 60 mph in 12 sec. It travels 60 mph for 1 min and then decelerates for 20 sec until it comes to rest. The speed of the car s(t) (in mph) at a time t (in sec) after the car begins motion can be modeled by: for 0sts 12 12 s(t) = 60 for 12 < ts 72 3 (92 – t) for 72 < t< 92 20 Determine the speed of the car 6 sec, 12 sec, 45 sec, and 80 sec after the car begins motion.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter2: Kinematics

Section: Chapter Questions

Problem 34PE: In World War II, there were several reported cases of airmen who jumped from their flaming airplanes...

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