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Q: An object moves at a constant speed when there is no ............. on it.
  • A. impulse
  • B. inertia
  • C. force
  • D. pressure
Correct Answer: Option C - An object moves at a constant speed when there is no external force on it. Force is a vector quantity. Its SI unit is Newton.
C. An object moves at a constant speed when there is no external force on it. Force is a vector quantity. Its SI unit is Newton.

Explanations:

An object moves at a constant speed when there is no external force on it. Force is a vector quantity. Its SI unit is Newton.