Moderate

Equations of kinetics are valid only when the acceleration is:

Correct answer: C. Constant

  • A. Increasing
  • B. Decreasing
  • C. Constant
  • D. Vary with time

Explanation

The equations of kinetics can be utilized for any motion that can be described as being either a constant velocity motion (an acceleration of 0 m/s2 or a constant acceleration motion. They can never be used over any time period during which the acceleration is changing. Equations of kinetics are only valid in uniform motion or non-accelerating motion or constant acceleration (a=0).

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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.

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