# Calculate the average speed

## Homework Statement

In the file below.

## Homework Equations

Speed= total distance over total time.
Acceleration = change of speed over time

## The Attempt at a Solution

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I tought it is just E because of the first rule above. But then I doubt my answer since it moved with constant acceleration first then constant speed. However, I don’t see thant any of the choices fit. Can someone help?

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PhanthomJay
Homework Helper
Gold Member
Your definition for speed is actually the definition for average speed. What is the total distance and what is the total time?

Sum of distance and sum of time?

PhanthomJay
Homework Helper
Gold Member
What is the sum of the distances? How much time elapsed in covering those distances?
Hint: for total time, try replacing t1 and t2 with numerical values to get an idea of total time in letter variables.

• YMMMA
Is it not d1+d2 for total distance? Aha, the hint makes this clear; it is just t2.
Next time I will assume some values. Thanks a lot.

PhanthomJay
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