40=1/2(vo+2.8)8.5
40(2)/8.5=vo+2.8
9.41=vo+2.8
Ahhh I see now, I had a minus sign in there before. I'm getting the right answer now.
vo=6.61m/s
Thanks so much for the response, you've helped me avoid a total meltdown. Seriously, I appreciate it.
A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final velocity of 2.80 m/s
a. Find the truck's original speed.
b. Find its acceleration
a) I'm using x=1/2(vo+v)t to find the original velocity but I keep getting vo=12.21m/s (the books answer is 6.61m/s)
b) For the...