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(D) The correct answer is $D$. According to Newton's second law of motion,the force $\vec{F}$ acting on a body is given by $\vec{F} = m\vec{a}$,where

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(D) The correct answer is $D$. According to Newton's second law of motion,the force $\vec{F}$ acting on a body is given by $\vec{F} = m\vec{a}$,where $m$ is the mass and $\vec{a}$ is the acceleration. $1$. If a body moves uniformly along a straight line,its velocity is constant,meaning acceleration $\vec{a} = 0$. From $\vec{F} = m\vec{a}$,if $\vec{a} = 0$,then $\vec{F} = 0$. Thus,no external force is required for uniform motion. $2$. For accelerated motion,$\vec{a} 
eq 0$,which implies $\vec{F} 
eq 0$. Therefore,any accelerated motion must be caused by an external force. $3$. From the relation $\vec{F} = m\vec{a}$,we can write $m = \frac{|\vec{F}|}{|\vec{a}|}$. This shows that the inertial mass is equal to the force required per unit acceleration. Since all statements are correct,the answer is $D$.

From Newton's second law of motion,it can be inferred that

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