- #1
bleedblue1234
- 109
- 0
Homework Statement
You plan a trip on which you want to average 97.2 kilometers per hour. You cover the first half of the distance at an average speed of only 72.5 kilometers per hour. What must your average speed be in the second half of the trip to meet your goal? Hint: Pick a distance.
I have tried this twice on webassign and gotten the wrong answer (I only have 3 submissions so i must make sure this is 100% right.
All answers need to be rounded to 3 sf's (only at end)
Homework Equations
V=d/t
The Attempt at a Solution
So i attempted to say your total distance traveled was 145km...
I then said that you traveled 72.5 km in one hour, and you next want to cover the last 72.5 km in x km/h in order to arrive at 92.7 km/h...
I next found the difference between the speed going half way and the wanted average speed (92.7) km/h... I then found the difference to be 20.2 which I added onto 92.7 to get 112.9 km/h
So would 112.9 km/h be my answer?
(or 113 with 3 sf's)
This is my first assignment for AP Phys B so bear with me (I am new