A body in one-dimensional motion has zero spe | vedclass

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(A) The magnitude of velocity is defined as speed.Mathematically,$v = |\vec{v}|$,where $v$ is speed and $\vec{v}$ is velocity.If the speed $v = 0$ at

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Zero velocity

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(A) The magnitude of velocity is defined as speed.Mathematically,$v = |\vec{v}|$,where $v$ is speed and $\vec{v}$ is velocity.If the speed $v = 0$ at an instant,then the magnitude of the velocity must also be zero.Therefore,the velocity $\vec{v}$ must be zero at that instant.Note that the acceleration does not necessarily have to be zero; for example,a ball thrown vertically upward has zero velocity and zero speed at its highest point,but it still experiences a constant acceleration due to gravity $(g = 9.8 \ m/s^2)$.

$A$ body in one-dimensional motion has zero speed at an instant. At that instant,it must have:

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