C. x-t curve has a maximum at 2s D. both A and C are correct 7. The motion of a body falling from rest in a resisting medium is described by the equation dv/dt = a-by, where a and b are constants. The velocity at any time tis A. a(1-b2t) B. [a(1-e-bt)]/b C. abe-t D. ab2(1-t)

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( frac{d v}{d t}=a-b v ) ( int frac{d v}{a-b v}=int d t ) ( -frac{log |a-b u|}{a-b v}=a e^{-b t} ) ( s 0 ; quad v=frac{aleft(1-e^{-b t}right)}{b} )

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