An airplane travels 2100 km at 1000km/hE. It encounters a wind and slows to 800 km/h E for the next 1300 km. What is the average velocity of the airplane for this trip?

The average velocity of the airplane for this trip is 1684.21 km/h

Explanation:

Average velocity is the rate of change of displacement with time. That is,

Average velocity = = Δx / Δt =

Now we will calculate the time taken by the airplane for the first motion before it encounters a wind.

From,

Velocity =

Time =

Therefore, Time =

Time = 2.1h

This is the time taken before the airplane encounters a wind.

Hence, t1 = 2.1h

Now, For the time taken by the airplane when it encounters a wind

Also from,

Velocity =

Time =

Therefore, Time =

Time = 1.625h

Hence, t2 = 1.625h

Now, to calculate the average velocity

Average velocity =

x1= 2100, x2= 1300, t1= 2.1h and t2= 1.625h

Hence, Average velocity =

Average velocity = 1684.21 km/h

c, liquids evaporate, creating a gas

i think that the answer is c