Posted by **joe** on Monday, September 30, 2013 at 2:50pm.

At the end of most landing runways in airports, an extension of the runway is constructed using a special substance called formcrete. Formcrete can support the weight of cars, but crumbles under the weight of airplanes to slow them down if they run off the end of a runway.

Part A

If a plane of mass 2.10×105kg is to stop from a speed of 30.0m/s on a 120m long stretch of formcrete, what is the magnitude of the average force exerted on the plane by the formcrete?

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