Question

After terminal velocity is reached, the acceleration of a body falling through a fluid is

• A. equal to \(g\)
• B. zero
• C. less than \(g\)
• D. greater than \(g\)
• E. constant but not zero

Hint:

Terminal velocity implies constant velocity → zero acceleration.

Answer 1

The Correct Option is B

Concept: Terminal velocity occurs when net force on the body becomes zero due to balance between downward gravitational force and upward drag force.

Step 1: Forces acting on body. \[ \text{Weight} = mg \quad (\text{downward}) \] \[ \text{Drag + buoyant force} \quad (\text{upward}) \]

Step 2: At terminal velocity. \[ \text{Net force} = 0 \Rightarrow F_{\text{net}} = ma = 0 \]

Step 3: Interpretation. If net force is zero, acceleration must be zero, and velocity remains constant.

Step 4: Conclusion. \[ \boxed{0} \]