Railroad car A, with mass 6275 kg, is traveling east at 6.5 m/s along a straight track. It strikes railroad car B, with mass 5155 kg, which is also traveling east along the same track at 3.8 m/s. The two railroad cars stick together. Assume the track is frictionless. How fast do the two attached railroad cars move immediately after the collision?
a. ANALYZE AND SKETCH THE PROBLEM

Knowns Unknowns

mA = vAi = = ?

mB = vBi =

B. SOLVE FOR THE UNKNOWN

Define the system

Write Pi = Pf in terms of the railroad cars’ masses and velocities.

Solve for vf

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

this is a good question! i'll do some research and come back when i have the answer!

this could be newton#'s law of cooling. the cooling curve is exponential