Which of the following is the only vector quantity?
Correct answer: D. Momentum
- A. Temperature
- B. Energy
- C. Power
- D. Momentum
Explanation
Momentum is the product of mass and velocity of a body. Mass is a scalar, and velocity is a vector. A vector multiplied by a scalar quantity results in a vector. So, momentum is a vector quantity, and its direction depends on that of the object's velocity.
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About Vectors and Equilibrium
Vectors have magnitude and direction, unlike scalars, and are combined by head-to-tail or parallelogram methods. Work covers rectangular components, equilibrium when the resultant force is zero, the scalar product for work and projections, and the vector product for torque and cross-product direction using the right-hand rule.
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