Indicate whether the following statements about collisions are true or false.
a. In an elastic collision, the momentum gained by one object equals the momentum lost by the other object.
b. In an inelastic collision, both momentum and kinetic energy are conserved.
c. In an inelastic collision, kinetic energy is conserved, but momentum is not conserved.
d. In an elastic collision, both momentum and kinetic energy are conserved. In an inelastic collision, the kinetic energy gained by one object equals the kinetic energy lost by the other object.