If a body falls with terminal velocity then
Correct answer: A. a = 0
- A. a = 0
- B. g = 0
- C. Both
- D. None
Explanation
At terminal velocity, the force of gravity acting on the body is balanced by the drag force, resulting in no net force. According to Newton's second law, if there is no net force, there is no acceleration. Therefore, the correct answer is a = 0. Option B is incorrect because the acceleration due to gravity, g, does not become zero; it is a constant at approximately 9.8 m/s2. Option C is incorrect because it states that both a and g are zero, which is not true. Option D is incorrect because it suggests that neither a nor g is zero, but in reality, a is zero at terminal velocity.
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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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