Answer:
Final; initial.
Step-by-step explanation:
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.
Hence, if we subtract the final speed from the initial speed and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
![Acceleration (a) = (final speed - initial speed)/(time)](https://img.qammunity.org/2021/formulas/physics/high-school/5gsqxhahnxj6w8d65f91np8dmf6qzeb4mk.png)
Where, a is acceleration measured in
![ms^(-2)](https://img.qammunity.org/2021/formulas/physics/middle-school/rai1gxlcsju5bovibi1bqyflbdbv4ho22n.png)
v is final speed measured in
![ms^(-1)](https://img.qammunity.org/2021/formulas/physics/middle-school/3aw027p6oy4gilll6t752x9ebs77pgsft1.png)
u is initial speed measured in
![ms^(-1)](https://img.qammunity.org/2021/formulas/physics/middle-school/3aw027p6oy4gilll6t752x9ebs77pgsft1.png)
t is time, measured in seconds.