## Conceptual Physics (12th Edition)

$$v=\frac{v_{1}+v_{2}}{1+\frac{v_{1}v_{2}}{c^{2}}}$$ Substitute the numbers. $$v=\frac{c+c}{1+\frac{c \times c}{c^{2}}}=c$$ Relative to the Earth, the drone still moves at c, the speed of light.