Defennder said:?? That's all you're given? I thought average speed was total dist/total time.
I presume that the distance up the hill equals the distance down the hill. (Without some such assumption, there would be insufficient information.)mossfan563 said:Homework Statement
A car travels up a hill at 31 km/h and then down a hill at 59 km/h.
Find the avg speed.
Ok I get a really small number. Is that legit?Ygggdrasil said:Assume the car travels x miles uphill and x miles downhill. Find the total time and divide 2x by the total time.
Doc Al said:I presume that the distance up the hill equals the distance down the hill. (Without some such assumption, there would be insufficient information.)
What's the most basic definition of average speed? Use it.
Good.mossfan563 said:The basic definition is total distance/total time.
Use Ygggdrasil's hint: Call the distance x (or D, if you like). In terms of the distance, find the time for going up and the time for going down.I have no instance of time and no distance either.
mossfan563 said:Ok I get a really small number. Is that legit?
I assumed the car traveled 10 km up and down and i divided by 20 (2x).
I got .024603...
Is that correct? Or am I doing something wrong?
Average speed is a measure of how fast an object is moving over a certain period of time. It is calculated by dividing the total distance traveled by the total time taken.
Average speed is the overall rate of motion over a period of time, while instantaneous speed is the speed at a specific moment in time. Average speed takes into account changes in speed, while instantaneous speed does not.
The units for average speed depend on the units used for distance and time. For example, if distance is measured in kilometers and time is measured in hours, then the units for average speed would be kilometers per hour (km/h).
Yes, average speed can be negative if the object is moving in the opposite direction of its initial velocity. For example, if a car is driving east at 50 km/h and then turns around and drives west at 25 km/h, its average speed for the entire trip would be -25 km/h.
The average speed of an object can be affected by factors such as distance, time, acceleration, and external forces (such as friction or air resistance). Changing any of these factors can result in a change in average speed.