Question

calculate light year, speed of light is 3.00 ×10^8 m/sec and 1 year is 365 days

Answer 1

$s = \frac{d}{t} \\ d = st \\ \\ d = (3 \times {10}^{8} )(365 \times 24 \times 60 \times 60) \\ 1 \: light \: year = 9.461 \times {10 }^{15} m$

Answer 2

Speed =distance /time
Distance =Speed ×time
=(3×10power8) (365×24×60×60)
1 light year = 9.461×10 to the power 15 metres