Question

A Derive an expression for
speed for a journey
which is divided inequal parts of
distance.​

Answer 1

Answer:

.............

....,................................

Answer 2

Answer:

Let' s start by reviewing some basic concepts. The average speed of an object is the ratio of the total distance

it travels to the total time of travel; in equation form this is :

average speed = (1)

total distance

time traveled = Åd

t

You have all calculated the average speed for a cart rolling down a ramp in a number of different experiments.

We have also been introduced to the concept of instantaneous speed, the speed of an object at a specific point

in time. (You can think of this as the speed shown on a car' s speedometer at the moment you observe it.) So

let' s say an object is traveling at 20 m/s when it enters a street and is traveling at 30 m/s when it exits the

street. Even though we don' t know either the total distance or total time traveled, we can find the average

velocity by using the simple definition of average :

average of two quantities = value of quantity 1 + value of quantity 2

2

Or in this case,

average speed = (2) speed 1 + speed 2

2 = 20 ms + 30 ms

2 = 25 ms