If a body moves down with constant, Speed, its acceleration is
Correct answer: C. 0
- A. g
- B. a > g
- C. 0
- D. constant
Explanation
The correct answer is 0. When a body moves with constant speed, its velocity does not change over time. Since acceleration is defined as the rate of change of velocity, a constant speed indicates that the acceleration is zero. Option A suggests the body is accelerating at the rate of gravity, which would imply a changing speed. Option B suggests an acceleration greater than gravity, which would also imply increasing speed. Option D is vague as it states the acceleration is constant but does not specify it being zero, which is necessary for constant speed.
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About Fluid Dynamics
Fluid flow is described through speed, pressure and density, including steady flow and the equation of continuity for conserving mass. Bernoulli's equation relates pressure, speed and height, while fluid drag and terminal velocity explain why a falling object eventually moves at constant speed when drag balances its weight.
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