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## Homework Statement

A truck on a straight road starts from rest, accelerating at 2.00m/s^2 until it reaches a speed of 20.0m/s. Then the truck travels for 20.s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00s.

a) How long is the truck in motion?

b) What is the average velocity of the truck for the motion described?

## Homework Equations

Constant acceleration equations

average speed formula

## The Attempt at a Solution

vfinal=20

vinitial=0

t=?

a=2.00

vfinal=vinitial + at

20=2t

t=10s

vaverage=[tex]\frac{xfinal=xinitial}{tfinal-tinitial}[/tex]

=[tex]\frac{100}{10}[/tex]

=10m/s

Now this is incorrect but can someone tell me the correct way of doing this problem?