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Which of the following option correctly describe the variation of the speed u and acceleration 'a' of a point mass falling vertically in a viscous medium that applies a force $F = - ku$ , where 'k' is a constant, on the body ? (Graphs are schematic and not drawn to scale)

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answer is B.

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Detailed Solution

The point mass's initial velocity will be zero and and maximum acceleration will have maximum acceleration when it begins to fall.

The influence of the viscous force acting on the mass causes its acceleration to become zero once it reaches a steady state velocity.

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