Posted by Leslie on Wednesday, September 2, 2009 at 11:39pm.
I don't know if im doing these problems right, please help...
A car accelerates at a constant rate from zero to 32.6 m/s in 10 seconds and then slows to 14.8 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds
would you do 32.6 + 14.8, and then divide by 15?
What was the acceleration during the first 10 seconds in the previous problem
would you do 32.6 divided be 10?

Science Physics Problem  Anonymous, Thursday, September 3, 2009 at 12:34am
Let V1 = starting velocity
Let V2 = ending velocity
The problem asks for the average acceleration for the 15 second period. The average acceleration would be the change in velocity over the time period.
dv/dt = (V2  V1)/(15 seconds) 
Science Physics Problem  drwls, Thursday, September 3, 2009 at 1:24am
In this case, the starting velocity is zero.