A car starting from rest acquires a velocity of $180 m s^{- 1}$ in $0.05 h r$ . Find the acceleration.

1 m s^{- 2}

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3.6 m s^{- 2}

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9 m s^{- 2}

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None of these

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Solution

The correct option is A $1 m s^{- 2}$
Initial velocity $= 0$
Final velocity $= 180 m s^{- 1}$
Time $= 0.05 h r = (0.05 \times 3600) s = 180 s$
So, acceleration = $\frac{180 - 0}{180} m s^{- 2}$ $= 1 m s^{- 2}$

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