**Sample Problem 2-6a**
The time taken to reach at the ground is 3.129843 sec

**Sample Problem 2-6b**
The displacements at times 1,2,3 sec in meter is 
  - 4.9  - 19.6  - 44.1  

**Sample Problem 2-6c**
The velocity at water surface is equal to -30.672463 km/h

**Sample Problem 2-6d**
The velocitis at times 1,2,3 sec in m/s is 
  - 9.8  - 19.6  - 29.4