Acceleration is given by:

where

v is the final velocity

u is the initial velocity

t is the time interval

Let's apply the formula to the different parts of the problem:

**A) **

Let's convert the quantities into SI units first:

t = 4.0 min = 240 s

So the acceleration is

**B) **

As before, let's convert the quantities into SI units first:

t = 94 s

So the acceleration is

**C) **

For this part we have to use a different formula:

where we have

v = 0 is the final velocity

u = 89.2 m/s is the initial velocity

a is the acceleration

d = 75 m is the distance covered

Solving for a, we find