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  • A car moving with 72 km/hr comes to rest in 5 second its acceleration is: (in <s

A car moving with 72 km/hr comes to rest in 5 second its acceleration is: (in m/s2)

Option: 1

-4


Option: 2

5


Option: 3

4

 


Option: 4

 -5


Answers (1)

best_answer

\text{Initial speed} \left ( u \right )= 72 \ \text{km}/\text{hr} =72\times \frac{5}{18}=20 \ \text{m}/\text{s}

\text{Final speed} \left ( v \right )= 0 \ \text{m}/\text{s}

\text{elapsed time}\left ( t \right )= 5 \ \text{seconds}

\text{Now},

\text{Acceleration}\ \left ( a \right )=\frac{\left ( v-u \right )}{t}

a=\frac{\left (0-20 \right )}{5}=-4 \ m/s^{2}

Posted by

sudhir.kumar

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