The displacement of a body in $8 s$ , starting from rest, with an acceleration of $20 {cm/s}^{2}$ is

64 m

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64 cm

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640 cm

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0.064 m

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Solution

The correct option is C $640 cm$
Given acceleration = $20 {cm/s}^{2} = 0.20 {m/s}^{2}$

Using second equation of motion, we know
$s = u t + \frac{1}{2} a t^{2}$
At $t = 0$ , the body is at rest
$∴ u = 0$
$\Rightarrow s = \frac{1}{2} a t^{2} = \frac{1}{2} \times (0.2) (64)$
$= 6.4 m = 640 cm$

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The displacement of a body in 8 s, starting from rest, with an acceleration of 20 cm/s2 is

The correct option is C 640 cmGiven acceleration = 20 cm/s2=0.20 m/s2 Using second equation of motion, we know s=ut+12at2 At t=0, the body is at rest ∴u=0 ⇒s=12at2=12×(0.2)(64) =6.4 m=640 cm

The displacement of a body in $8 s$ , starting from rest, with an acceleration of $20 {cm/s}^{2}$ is

The correct option is C $640 cm$
Given acceleration = $20 {cm/s}^{2} = 0.20 {m/s}^{2}$

Using second equation of motion, we know
$s = u t + \frac{1}{2} a t^{2}$
At $t = 0$ , the body is at rest
$∴ u = 0$
$\Rightarrow s = \frac{1}{2} a t^{2} = \frac{1}{2} \times (0.2) (64)$
$= 6.4 m = 640 cm$