I have a initial velocity of 125 and it stops at 0.007 seconds what's the acceleration

Question

Roberto shoots a bullet out of his little 22 rifle. He happens to know that his gun shoots bullets out at an initial velocity (starting speed) of 125 m/s. The bullet soars across the firing range before embedding itself into the straw target. after hitting the target it takes the bullet 0.007 seconds to come to a complete stop.
what was the acceleration of the bullet while stopping?

Answer 1

a = (v₂ - v₁)/t = (0 - 125)/0.007 m/s² = -125/0.007 m/s² = ? m/s²

 

The negative value means the acceleration is opposite the direction of motion.  Evaluate and finish.