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

2 m s^{- 2}

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0.8 m s^{- 2}

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7.5 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, $v = 20 m s^{- 1}$
Time, $t = 25 s$

From the first equation of motion,
$v = u + a t$
$20 = 0 + a \times 25$
$⟹ a = \frac{20}{25} = 0.8 m s^{- 2}$

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4 {ms}^{- 1}

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4 s

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