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The diagram shows a 2 kg box travelling at 3 m/s colliding with and sticking to a second box on a frictionless surface. The resultant
velocity of the two boxes combined is 1 m/s. What is the mass of the second box, to the nearest kilogram?
v=1m/s
V 3m/s
m - 2 kg
vOm/s
m = ? kg
Toitii
Final

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

c. electrical charges of ionic bonds.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.