What is the base unit of power and what is the correct option?

Here are the solutions to the questions:

1. The kg m² s⁻³ is the base unit of Power.

• Power (P) is defined as energy (E) per unit time (t): $P = \frac{E}{t}$.
• Energy (E) has units of Joules (J), which in base units is kg m² s⁻².
• Therefore, the unit of power is $\frac{\text{kg m}^2 \text{ s}^{-2}}{\text{s}} = \text{kg m}^2 \text{ s}^{-3}$.

The correct option is B.

2. The power required to keep the aircraft moving with constant velocity is given by: