An electron is travelling at 90 % of the speed of light. Calculate the speed of the electron. The speed of light is 3.0 ✕ 10^8 m/s.
I don’t write backwards – filmed on a lightboard from Learning Glass
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I really love these videos but the sound of writing gives me goosebumps
I did it differently. Instead of finding 90% I found 10%, which is
(3×10^8) ÷ 10 = 3×10^7
and c – 3×10^7 = 2.7×10^8 m/s