M A 6.0 kg wagon moving right at 3.0 on a frictionless track collides and sticks to a 4.0 kg wagon moving
S
m
left at 12
S
х
What is the final speed of the wagons?
Consider rightward as the positive direction.
Round answer to two significant digits.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.