The nearest star to the earth is the red dwarf star proxima centauri, at a distance of 4.218 light-years. convert this distance to barleycorns. (1barleycorn=1/3 inch.)

Explanation:

The nearest star to the Earth is the red dwarf star Proxima Centauri, at a distance of 4.218 light-years.  

Light year is the unit of distance covered by the heavenly bodies. 1 light year is equal to :

So,

We need to convert 4.218 light-years barley corns.  

Since, 1 barleycorn = 1/3 inch  

So, the nearest star to the Earth is at a distance of . Hence, this is the required solution.

c. newton's third law of motion