Speed is calculated by taking divided by time.

The speed of any object  is the distance travelled in a unit time  

Speed = distance / time

Unit of speed  = distance in meter / time in second

= ms-1

For example  

The speed of light is 2.9979 x108 m/s.  

Distance travel by light in 1 s = 2.9979 x108 m

Distance divided by time

Explanation:

I took the test on edge

no, the red giant is the hottest with 2.00.000.000 degrees celsius. while the white dwarf only 25,000 degrees celsius.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.