WP:MATH
w v 2 = k d 3 ( t d ) n {\displaystyle wv^{2}=kd^{3}\left({\frac {t}{d}}\right)^{n}}
ω A = 50 m s − 1 50 m = 1 s − 1 {\displaystyle \omega _{A}={\frac {50\ ms^{-}1}{50\ m}}=1s^{-}1}
ω B = 50 m s − 1 × c o s ( θ ) 50 m / c o s ( θ ) = 50 m s − 1 × 0.5 50 m / 0.5 = 25 m s − 1 100 m = 0.25 s − 1 {\displaystyle \omega _{B}={\frac {50\ ms^{-}1\times cos(\theta )}{50\ m\ /\ cos(\theta )}}={\frac {50\ ms^{-}1\times 0.5}{50\ m\ /\ 0.5}}={\frac {25\ ms^{-}1}{100\ m}}=0.25s^{-}1}
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R = V b a t t e r y − V f o r w a r d I L E D {\displaystyle R={\frac {V_{battery}-V_{forward}}{I_{LED}}}}
