Wednesday
October 22, 2014

Homework Help: Physics

Posted by Tammy on Wednesday, September 12, 2007 at 4:43pm.

A car starts from rest and accelerates at 5 m/s^2 for 4 s, then maintains that velocity for 3 seconds, then decelerates at the rate of 2m/s^2 for 3 seconds.
a) what is the final speed of the car?
b) how far does the car travel?

a) v = v_0 +at
= 0+5(4)= 20m/s
=0+5(3)= 15m/s
=0+2(3)=6m/s

so I found the veolcity for each of the three parts what would be the final velocity? would it be v-v_0 so 6-20 =-14m/s

b) d=vt
=20*4=80m
=15*3=45m
=6*3=18m

then I add these all up and got 143m as the answer.

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