Answer:
Acceleration,

Explanation:
The final velocity of an object moving in one dimension is given by the following formula as :
...........(1)
where
u is the initial velocity
a is the acceleration
t is the time taken
We need to solve equation (1) to find the value of a. Subtracting u on both sides of the equation :

Now divide both side of the equation by t as :

So, the correct option is (d).