Zoom a 50,000 kg box car traveling at 5.5 m/sec and is loaded with a dubious cargo. as it travels north on a railroad track it collides inelastically (stickage) with 3 empty box cars ( at rest ) which have a combined mass of 30,000 kg. determine the final velocity of these cars as they travel down the track.

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?