- #1

Alexanddros81

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## Homework Statement

Serway Physics Chapter 2

20. An object moves along the x-axis according to the equation ##x=3.00t^2 - 2.00t+3.00##,

where x is in meters and t is in seconds. Determine (a) the average speed between

t=2.00s and t=3.00s, (b) the instantaneous speed at t = 2.00s and at t=3.00s, (c) the average acceleration

between t=2.00s and t=3.00s and (d) the instantaneous acceleration at t=2.00s and t=3.00s.

(e) At what time is the object at rest?

## Homework Equations

## The Attempt at a Solution

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In part (a) I calculated average velocity but it asks for the average speed which is

given by ##v_{avg} = \frac {d} {Δt}## where d is distance traveled between 2 and 3 seconds, which is

13m. So average speed is the same as average velocity in this case.

Is the above correct?