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Q.

The value of $90$ miles per hour in $S . I$ units is:

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a

$20 m s^{-}$

b

$40 cm s^{-}$

c

$40 m s^{-}$

d

$44 m s^{-}$

answer is A.

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Detailed Solution

$\frac{90 miles}{hr} = \frac{90 miles}{hr} \times \frac{1.6 \times 10^{3} m}{1 mile} \times \frac{1 hr}{60 \times 60 s} = 40 {ms}^{-}$

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