What is the acceleration of a car that starts from rest and attains a speed of $20 m s^{- 1}$ in 25 seconds?

$2 m s^{- 2}$

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$0.8 m s^{- 2}$

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$0.7 m s^{- 2}$

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$4 m s^{- 2}$

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Solution

The correct option is B
$0.8 m s^{- 2}$

Given, initial velocity, $u = 0 m s^{- 1}$ , final velocity, $v = 20 m s^{- 1}$ and time taken, $t = 25 s .$
Let 'a' be the acceleration.
Using first equation of motion,

$v = u + a t$

$∴ 20 = 0 + a \times 25$

$\Rightarrow a = \frac{20}{25} = 0.8 m s^{- 2}$

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