A 500 kg freight car rolls to the right and collides with a 10,000kg freight car sitting at rest on a track. The cars connect as they collide and move to the right together at a speed of 2m/s. what was the initial speed of the 500 kg car ? [neglect friction]​

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.