If x = at + bt2, where x is the distance travelled by the

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If x = at + bt², where x is the distance travelled by the body in kilometers while t is the time in seconds, then the unit of b is

1. km/s
2. kms
3. km/s²
4. kms²

Correct Option: C

[x] = [bt²].
Hence [b] = [x / t²] = km/s².