Theories are usually backed up with a lot of evidence. If the evidence is well studied then it is useful information.
Answer:
A., an action which causes movement and an opposite reaction
Explanation:
I don't really know how to explain it, but this helped hopefully! :) Have a bless day
Efficiency = (energy that does the job) / (total energy used)
= (45 J) / (120J)
I think you can handle the division.
d = speed x time
distance = 29 x 30
distance = 870m
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