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I still don't get this one  :
1. Explain to me why a lot of braking power and a lot of engine power is not relevant to an accident.
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To me, Jack, 1. is ambiguous. If you want to express,
this and also that, as a separate list,
it, then a singular verb, "is", is required. If you want to express,
this and that, together,
these, then it requires a plural verb, "are".
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2. Explain to me why this car and that car are the same.
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"the same" implies a comparison of two or more things, and it's for that reason that "are" is required.