brought to rest by suctessively crushing steel barrels. The length of the crash ushion is 5.0 m, and the magnitude Fof the force required to crush the barrels as a unction of the distance z the car has moved into the cushion is given by 85KN (0 <2S 1.7m) 130KN (1.7

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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An uncontrolled 850 kg car strikes squarely a motorway crash cushion in which the car
is brought to rest by suctessively crushing steel barrels. The length of the crash
cushion is 5.9 m, and the magnitude Fof the force required to crush the barrels as a
function of the distance r the car has moved into the cushion is given by
85KN (0 <2S 1.7m)
130kN (1.7 < r < 4.4m)
170kN (4.4 sI5 5.9m)
a)
Decermine an expression for the work done by the force F as a function of r.
b)
If the car strikes the crash cushion with a velocity of 138 km/h, determine the
distance the car will move into the cushion before it comes to rest and the
maximum deceleration of the car.
Transcribed Image Text:An uncontrolled 850 kg car strikes squarely a motorway crash cushion in which the car is brought to rest by suctessively crushing steel barrels. The length of the crash cushion is 5.9 m, and the magnitude Fof the force required to crush the barrels as a function of the distance r the car has moved into the cushion is given by 85KN (0 <2S 1.7m) 130kN (1.7 < r < 4.4m) 170kN (4.4 sI5 5.9m) a) Decermine an expression for the work done by the force F as a function of r. b) If the car strikes the crash cushion with a velocity of 138 km/h, determine the distance the car will move into the cushion before it comes to rest and the maximum deceleration of the car.
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