Question

Identify the correct S.I units for the given quantities .

• A. Speed: $mh{r}^{-1}$
  Time: $hr$
• B. Speed: $kmh{r}^{-1}$
  Time: $hr$
• C. Speed: $kmmi{n}^{-1}$
  Time: $min$
• D. Speed: $mse{c}^{-1}$
  Time: $sec$

Answer 1

The correct option is D Speed: $mse{c}^{-1}$

Time: $sec$
Speed = $\frac{\text{Distance}}{\text{Time taken}}$

The S.I unit of time is second(sec) and distance is metre(m). So the S.I unit of speed is metre per second ($mse{c}^{-1}$).