A bus in motion increases its speed from $30 k m h^{- 1}$ to $60 k m h^{- 1}$ in 20 seconds. Find its acceleration.

0.21 m s^{- 2}

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0.42 m s^{- 2}

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0.63 m s^{- 2}

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0.84 m s^{- 2}

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Solution

The correct option is B $0.42 m s^{- 2}$
The first eq of motion $v = u + a t$
$30 k m / h = 8.13 m / s, 60 k m / h = 16.6 m / s$
using value of equation we have $16.3 = 8.3 + a * 20$
$a = \frac{8.3}{20} = 0.42 m / s^{2}$

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