Hydrogen fuel cells is the answer
Answer:
Speed is solved with time and distance but has no direction
Average velocity is solved with Δx/Δt and has a direction
Isotopes of an element will contain the same number of protons and electrons but will differ in the number of neutrons they contain. In other words, isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons
The mass would be the same
47kg on the moon as well
gamma radiation and heat flares from the sun, they use refelective gold sheets
