First slide

Rectilinear Motion

Question

A body moves with initial velocity 10m/s. If it covers a distance of 20m in 2s, then the acceleration of the body is………..

Easy

A

$2 m / s^{2}$
B

$5 m / s^{2}$
C

$0 m / s^{2}$
D

$20 m / s^{2}$

Solution

Given that $u = 10 m / s$
$s = 20 m t = 2 s = a = ?$
From equation $s = u t + \frac{1}{2} a t^{2}$
$\begin{array}{l} \Rightarrow 20 = (10 \times 2) + \frac{1}{2} a (2)^{2} \\ \Rightarrow 20 = 20 + 2 a \\ \Rightarrow 2 a = 0 \\ \Rightarrow a = 0 m / s^{2} \end{array}$

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