A car starts from rest and accelerates to a speed of 20 m/s in a time of 5 s. Find out the average acceleration of car?

100 m / s^{2}

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80 m / s^{2}

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40 m / s^{2}

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20 m / s^{2}

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4 m / s^{2}

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Solution

The correct option is E $4 m / s^{2}$
Given : $u = 0$ m/s $v = 20$ m/s $t = 5$ s
Using $v = u + a t$
$∴$ $20 = 0 + a \times 5$ $⟹ a = 4$ $m / s^{2}$

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