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as the acceleration is constant, to travel 1km=1000m, we use 1000 m =(1/2) (5 m/s^2)t^2, so t=sqrt(21000/5)=20 seconds

Social factors can have a considerable effect on birth rates. Education levels greatly effect birth rates, educated woman are much more likely to be career mind and less intent on having large numbers of ...

The concept of 'scarce resources' refers to the basic economic theory that the market will consistently have insufficient resources to fulfill all of society's wants and needs. The price of a product in t...

Only plant cells have a cell wall, vacuole, chloroplasts.

Both plant and animal cells have a cytoplasm, cell membrane, mitochondria, nucleus, ribosomes and chromosomes.

Ethnic minority migrants often concentrate in the city center upon first settling in a new city due to the presence of cheaper housing usually found in these areas; migrants are often found to have relati...