We have two basic kinematic equation for the given situation

    S =     (1)   (S is the distance, "a" is the acceleration, t is the time)

and

    V = at        (2)    (V is the speed).



Substitute the given values into equations:


    75 =       (1')

    25 = at          (2')


From (2')  express  t = .   Substitute it into (1').  You will get


    75 =  = .


It gives  a =  =  =  = 4  m/s^2 = 4.166... m/s^2 = 4.166 m/s^2   (rounded).


ANSWER.  The acceleration is  4  m/s^2 = 4.166... m/s^2 = 4.166 m/s^2   (rounded).