Any math geniuses? How to multiply these?

1, I don’t know how to multiply "4 grams times 9 volts" can you?

2, how about 4 grams times 3 miles per hour? Or impossible?

Updates
10 mo
Hurray, without bias everyone can see einstein equation is fake! Energy is "mass times speed" is impossible. But if einstein said it you *beleive him!
His genius was making equations that convinced physicists, but anyone can see he was not correct!
Any math geniuses? How to multiply these?
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