**Bullet problem**
USE THE FOLLOWING TO FIND THE ACCELERATION
v^2 - v0^2= 2ax
and convert x=10cm =0.1 m
a= [ (300x3000) - ( 400x 400)]/(2 x0.1)= - 35 X 10^4 m/s^2
the acceleration is negative because it is losing speed
V= vo + at , thus t= [V- Vo]/a
[ 300- 400]/( -35 x10^4) = 2.857 x 10^(-4) seconds
after you find a, then use the relation v= v0 + at to find the time
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Last edited by joephos; Sep 28th 2009 at 07:46 PM.
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