How much time does it take for a bird flying at a speed of 45 kilometers per hour to travel a distance of 1800 kilometers?

To solve this problem, let us first assume that the bird was

flying at zero acceralation (constant velocity) so that we can use the

equations for linear motion. The formula relating velocity, distance and time

is:

v = d / t

where

v = velocity = 45 km / hr

d = distance travelled = 1800 km

t = time elapsed = (unknown)

Rewriting in terms of t:

t = d / v

Substituting the given values to find for t:

t = 1800 km / (45 km / hr)

t = 40 hr

Therefore it takes about 40 hours for the bird to travel

that distance.

Explanation:

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.