A boxcar of length 10.1m and height 2.4m is at rest on frictionless rails. Insid

Question

A boxcar of length 10.1m and height 2.4m is at rest on frictionless rails. Inside the boxcar (whose mass when empty is 3900kg) a tank containing 2000kg of water is located at the left end. The tank is 0.8m long and 2.4m tall. At some point the walls of the tank start to leak, and the water fills the floor of the boxcar uniformly. Assume that all the water stays in the boxcar. What is the displacement of the boxcar 10s after the water has settled in the bottom? (Take positive displacement as being to the right.)

Explanation / Answer

Why the box car will move at all? Every thing is within the boxcar-tank system. Newtons 3rd won't allow it to move. It will not move .

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