Answer:
The acceleration from it's legs is

Step-by-step explanation:
Let's order the information:
Initial height:

Final height:

The bush accelerates from
to
.
We can use the following Kinematic Equation to know the velocity at
:

where g is gravity's acceleration (9.8m/s). Since
,

⇒

Working with the same equation but in the first height interval:

Since
and
,

⇒

⇒
⇒
