A 0.20 kg plastic cart and a 2.0 kg lead cart can both roll without friction along a horizontal track. Equal- size forces are used to push each cart forward for 1 m, starting from rest. After the force is removed at x  1 m, which of the following statements is true? a. The kinetic energy of the plastic cart is less than the kinetic energy of the lead cart. b. The kinetic energy of the plastic cart is equal to than the kinetic energy of the lead cart. c. The kinetic energy of the plastic cart is greater than the kinetic energy of the lead cart. d. There is not enough information to compare the kinetic energies of the two carts.

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.