Convert an acceleration of 45km min-2 into ms-2

1.	Convert an acceleration of 45km min-2 into ms-2
Answer» Why can it become 12.5m/s2 where is -2<br>Why????<br>3.6 km/m 2\xa0= 1m /s2 Hence 45 km /m2÷\xa03.6 = 12.5 m /s2<br>I don\'t know the answer pls can you help me<br>4

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