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MMLU / Two ice skaters are moving on frictionless ice and are about to collide. The…

Problem

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question

Two ice skaters are moving on frictionless ice and are about to collide. The 50-kg skater is moving directly west at 4 m/s. The 75-kg skater is moving directly north at 2 m/s. After the collision they stick together. For this scenario, which of the following is true?

choices

  1. The linear momentum of the system is conserved because the net force on the system is nonzero during the collision.
  2. Only the kinetic energy of the system is conserved because it is an inelastic collision.
  3. Only the kinetic energy of the system is conserved because it is an elastic collision.
  4. The linear momentum of the system is conserved because the net force on the system is zero.

subject

high_school_physics

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