A railway wagon of mass 2.0×104kg is moving with a speed of 2.0m s−1 along a horizontal track. A set of buffer springs placed ahead is designed to bring the wagon to rest.
a. (i) Calculate the work that must be done on the wagon to stop it.
b. (ii) Express the work found in part (i) in kilowatt-hours (kW h).
c. (iii) The buffering arrangement accomplishes the stopping in 0.40s. Determine the average power developed by the springs during this process.