Posted by **K** on Wednesday, August 28, 2013 at 9:54pm.

A car travels in a straight line with an average velocity of 80 km/hr for 2.5 hours and then with an average velocity of 40 km/hr for 1.5 hours.

a. Calculate the largest displacement for the 4-hour trip.

b. Calculate the largest average velocity for the total trip in kilometers per hour.

Please if possible show all work, thanks for you help :)

- Physics -
**Steve**, Thursday, August 29, 2013 at 3:18pm
80*2.5 + 40*1.5 = 200+60 = 260

What does it mean to say "largest average velocity for the total trip"?

There is only one average velocity for the total trip: 260/4 = 65 km/hr

I think they want you to say 80 km/hr, since after the first section the average velocity is lower. However, we know nothing about the velocity at other times. Maybe at some point in the first 2.5 hours the velocity was 300 km/hr, raising the average to 120 km/hr, but then slowed way down so at the end of the 2.5 hours, the average was only 80. Or, maybe at some point in the later section, again the velocity spiked way up, raising the average until then to some large amount.

If the question was posed as you typed it, it was very poorly worded.

## Answer This Question

## Related Questions

- physics - A car travels in a straight line with an average velocity of 85 km/h ...
- Physics - A car travels from City A to City B to the north. It takes 4 hours, ...
- physics - A Honda Civic travels in a straight line along a road. Its distance x ...
- HURRY........quick post - Simpson drives his car with an average velocity of 1.2...
- Physics - 1. A car undergoes a displacement of 500m due east, followed by ...
- Physics - A Honda Civic travels in a straight line along a road. Its distance x ...
- Physics - How would i find the average velocity for certain points.? finding the...
- Physics - How would i find the average velocity for certain points finding the ...
- physics - A race car travels northward on a straight, level track at a constant ...
- Physics - A bus travels 280 km south along a straight path with an average ...

More Related Questions