Scientific Method: How can a causal question be answered?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?