If Sachin combined all forces applied to the ball then we can say he has calculated:

In this question, Sachin collected all forces applied in the ball means if he combined all the forces acting in a ball then we can get easily the final force. 

The sum of all the forces acting on any object is called as the net force. 

A mass can be accelerated by a net force. Another force acts on a body at rest or in motion. 

When there are a large number of forces in a system, the net force is used.

Sachin combines all the forces acting on a ball. Then we can say he is finding the net force.