A car accelerates uniformly so that it goes from a velocity of $20 m / s$ to a velocity of $40 m / s$ in $5$ seconds. Find out the acceleration of a car?

0.2 m / s^{2}

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4 m / s^{2}

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5 m / s^{2}

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10 m / s^{2}

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80 m / s^{2}

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Solution

The correct option is A $4 m / s^{2}$
Given : $u = 20$ m/s $v = 40$ m/s $t = 5$ s
Using $v = u + a t$
$∴$ $40 = 20 + a (5)$ $⟹ a = 4$ $m / s^{2}$

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