We use the following formula to determine our acceleration:

We normally use letters in this formula, which gives us:

Filling in this formula gives us:
Δv (change of velocity) = 12 - 4 = 8 m/s
t = 1s

So our answer: the acceleration is
The average rate of change of distance over the time interval
3 ≤ t ≤ 6 represents the coin's average velocity over that interval.
11 m/s simply divide the momentum with the mass
The ratio of the distance a bullet travels to the amount of time it takes to travel is known as the speed or velocity of the bullet, depending on whether we need to know the direction or not. Speed is a scalar quantity. It describes to "how fast an object is moving", in our case how fast the bullet is moving.Velocity is a vector quantity. velocity describes "the rate at which an object changes its position".