Answer:
55kmh
Explanation:
first of all according to formula add both of the velocity and divide it by 2
I believe the answer is up and down :)
Answer:1.5×10 to the power of 17(unit-Hertz/H)
Explanation:V=F×Wavelength
F=V/Wavelength=3×10 to power/2×10 to power of -9=1.5×10 to power of 17