Question

The SI unit of power is a watt. It is expressed in the terms of mass, length, and time as

• A. kg m²s^-3
• B. kg ms^-1
• C. kg² m²s^-2
• D. kg ms^-2

Answer 1

The correct option is A

kg m²s^-3

Correct Answer

$\left(c\right)kg\times m^2\times s^{-3}$

Explanation

We know that

$$\begin{gathered} Power=\frac{Workdone}{Time} \\ Watt=\frac{Joule}{second} \\ Watt=\frac{N\times m}{s} \\ Watt=\frac{kg\times m\times s^{-2}\times m}{s} \\ Watt=kg\times m^2\times s^{-3} \end{gathered}$$

Hence the correct answer is option (a) kg m²s^-3