You’re assessing the Engineered Material Arresting System (EMAS) at New York’s J

Question

You’re assessing the Engineered Material Arresting System (EMAS) at New York’s JFK airport. The system consists of a 132-m-long bed of crushable cement blocks, designed to stop aircraft from sliding off the runway in emergencies. The EMAS can exert a 300-kN force on a 55-Mgjetliner that hits the system at 36 m/s .

Part A

Can it stop the plane before it plows through all the blocks?

You’re assessing the Engineered Material Arresting System (EMAS) at New York’s JFK airport. The system consists of a 132-m-long bed of crushable cement blocks, designed to stop aircraft from sliding off the runway in emergencies. The EMAS can exert a 300-kN force on a 55-Mgjetliner that hits the system at 36 m/s .

Part A

Can it stop the plane before it plows through all the blocks?

Explanation / Answer

Using equation of motions, v2=u2-2 a s,

Here final speed v=0, initial speed u= 36m/s, stopping distance, s= 132m

0=362-2*132*a

so, a = 81/16 m/s2

Force required = ma = 55000 kg *81/16 m/s2 =278.43 *103N =278.43 kN

Since EMAS can exert a force of 300kN which is more than 278.43 kN, therefore it can stop the plane

Yes, it can stop the plane

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