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Q.

A bus decreases its speed from 80 kmph, to 60 kmph, in 5 s. Find the acceleration of the bus

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a

a = - 2.11 {ms}^{- 2}

b

a = + 2.11 {ms}^{- 2}

c

a = - 1.11 {ms}^{- 2}

d

a = + 1.11 {ms}^{- 2}

answer is C.

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Detailed Solution

a = \frac{\vec{v} - \vec{u}}{t}

$a = \frac{(60 - 80)}{5} \times \frac{5}{18}$ $(∵ kmph = \frac{5}{18} {ms}^{- 1})$

$= - \frac{20}{18} = - 1.11 {ms}^{- 2}$

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A bus decreases its speed from 80 kmph, to 60 kmph, in 5 s. Find the acceleration of the bus