4. A 15,000kg railroad car moving at 7m/s to the right collides and sticks to another railroad car with a mass of 17,000kg that is moving in the same direction at 1.5m/s.
What is the velocity of the joined cars after the collision?

B) as the temperature increases, the kinetic energy of the particles increases.|-/

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !