In vertical jump consists of two parts. The first stage is the quick acceleration of the center of mass from a crouching to a standing position. The center of mass rises by 30 cm in this stage. In the second stage, the player's feet leave the floor and the center of mass rises 55 in$.$ under the influence of gravity alone. 

 

What is the average acceleration during the first phase of the jump? $($Round the final answer to two decimal places.