(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

Constant acceleration equations

average speed formula

3. 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?

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# Homework Help: Acceleration of a Truck Problem

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