Answer:
the relative speed should be 40mph
Explanation:
The answer is C but man if you have leak or a meltdown good luck to anyone downstream.
A single photon carries an energy equal to

where h is the Planck's constant and f is the frequency of the photon.
This means that the higher the frequency of the light, the higher the energy. Among the 5 different options mentioned by the problem, the light with highest frequency is ultraviolet, which has frequencies in the range [3-30] PHz, while visible light (red, blue, green) and infrared have lower frequency, so ultraviolet light has the highest energy per photon.
I honestly don't see anything above. But 'H' on a weather map usually shows the center of a high-pressure system.
Momentum = mass x velocity
= (1200)(25)
Momentum = 30,000 kg m/sec
hope this helps :)