Physics homeowork Average Velocity

[MMM123456]

Hello everyone i need help in my physics homework my class is tomorrow and i ve been trying to solve it since 2 days but i don't now how to

A driver moves 1/3 of the way between two cities with speed of 60 km/hour

he continuous with speed of 90 km/hour find the average velocity? the car is moving to the right

please help me

 

[azizlwl]

You should know that distance moves= average velocity x time.
Find all the equations that relate to above equation.

 

[Ripe]

The formula for average velocity is Δs/Δt, i.e. change in displacement over the change in time (or time taken), as I hope you're aware of.

Now, what you have to do is find an expression for time, using s for displacement and the known speeds. Try it yourself from there and reply if you're having difficulties.

What you could do, if you want to simplify the question, is to instert a known value for the displacement. Since the only information you've got is the fraction of which he drove at the two speeds, this wouldn't affect the final answer as the displacement cancels out in the calculations.

EDIT: I was away and did not notice the above poster. My bad.

 

[NascentOxygen]

Hello everyone i need help in my physics homework my class is tomorrow and i ve been trying to solve it since 2 days but i don't now how to

A driver moves 1/3 of the way between two cities with speed of 60 km/hour

he continuous with speed of 90 km/hour find the average velocity? the car is moving to the right

please help me

Let the distance between the cities = x km.
and proceed from there ...

 

[Nickie]

Hi there, it seems like you are having trouble with calculating average velocity. I am happy to help you understand this concept. Average velocity is the total displacement divided by the total time taken. In this case, the displacement is the distance between the two cities, which is 2/3 of the total distance. The time taken is the sum of the time taken at each speed. So, we can calculate the average velocity as follows:

Average velocity = (2/3 of the total distance) / (total time taken)

To find the total time taken, we need to divide the distance traveled at each speed by the respective speed. So, the total time taken is (1/3 of the total distance) / (60 km/h) + (2/3 of the total distance) / (90 km/h).

Now, we can plug these values into the equation for average velocity:

Average velocity = (2/3 of the total distance) / ((1/3 of the total distance) / (60 km/h) + (2/3 of the total distance) / (90 km/h))

Simplifying this, we get:

Average velocity = 72 km/h

Therefore, the average velocity of the car is 72 km/h. I hope this helps you understand how to calculate average velocity. Good luck with your homework!