Answer:
the speed in light-year per second is 2.155 x 10⁻¹³ ly/s.
Explanation:
Given;
speed in miles per hour (mph), v = 76 mph
1 mile = 1.701 x 10⁻¹³ light-year (ly)
1 hour = 60 s
The speed in light-year per second is calculated as follows;
[tex]v = \frac{76 \ miles}{hour} \times \frac{1.701 \times 10^{-13} \ ly}{1 \ mile} \times \frac{1 \ hour}{60 \ s} = 2.155 \times 10^{-13} \ ly/s[/tex]
Therefore, the speed in light-year per second is 2.155 x 10⁻¹³ ly/s.
