Aboxcar of length 8.00 m and height 2.40 m is at rest on frictionless rails. the empty boxcar has a mass of 3750 kg. inside the boxcar, located at the left end, is a tank containing 2450 kg of water. the tank is 2.00 m long and 2.40 m tall. the tank starts to leak, and the water fills the floor of the boxcar uniformly. assume that all the water stays in the box car. 1) what is the displacement of the boxcar 14 s after the water has settled in the bottom?