Resistive Force Differential Equation

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An object of mass $m$ is subject to a resistive force given by $F_r = -kv$ , where $v$ is the velocity of the object and $k$ is a positive constant. Which of the following represents the differential equation for the object’s velocity?

$m \frac{dv}{dt} = kv$

$m \frac{dv}{dt} = -kv$

$m \frac{dv}{dt} = k$

$m \frac{dv}{dt} = -k$

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