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# The acceleration-displacement graph of a particle moving in a straight line is as shown in the figure, initial velocity of particle is zero. Find the velocity of the particle when displacement of the particle is $s = 12\,m$. A. $3\sqrt 2\,m/s$B. $2\sqrt 5 \,m/s$C. $4\sqrt 3 \,m/s$D. $4\,m/s$

Last updated date: 21st Jul 2024
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Hint: The rate of change of an object's velocity with respect to time is called acceleration in mechanics. Accelerations are quantities that are measured in vectors (in that they have magnitude and direction). The orientation of the net force acting on an object determines the orientation of its acceleration.

A displacement vector is a line drawn from an object's original location to its final position.Acceleration is a vector that depicts the degree and direction of velocity changes. Meters per second per second, or metres per second squared, are the normal units.

The initial velocity multiplied by time plus one-half the acceleration multiplied by the square of time equals displacement. Displacement can be measured by subtracting the original distance from the final distance away from a point. When it comes to deciding velocity, displacement is crucial (which is also a vector). We know that
$a = v\dfrac{{dv}}{{dx}}$
$\Rightarrow adx = vdv$
Upon integrating
$\int_0^v v dv = \int_0^{12} a ds$
Here, area under the curve $= \dfrac{{{V^2}}}{2}$
$\Rightarrow \dfrac{{{V^2}}}{2} = 24$
$\therefore V = 4\sqrt 3$

Hence option (C) is correct.

Note: The metre is the SI unit for displacement (m). The vector variation between an object's finishing and beginning points is known as displacement. The rate at which displacement varies over time is referred to as velocity. The derivative of position with respect to time is instantaneous velocity. Acceleration is a vector that depicts the degree and direction of velocity changes.