Distinguish between instantaneous speed and average speed. a man drives a car a distance of 200km at an average speed of 44kmh¹,what must be it's average speed for the next 220km, if the car is to cover the total distance in 9 hours?

49.32km/h

Explanation:

Given a man drives a car a distance of 200km at an average speed of 44km/h

We know that

initially

time=4.54 hours

Now Given the total trip should be completed in 9 hours

the time taken to complete the second part of the trip is 9-4.54=4.46 hours

Given the distance travelled in the second half is 220km

We know that  

average speed = 49.32 km/h.

change tension

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.