You got it backwards, in fact when the shovel is moving a force is applied to the snow ball and when the shovel stops is movement the force will be $0$ thanks to Newton's second law: $F=ma$; if the acceleration is $0$ then the force is $0$. Anyway the ball will keep moving because of the inertia.

Bye! :D

You have it backwards, in fact when the shovel is moving a force is applied to the snow ball and when the shovel stops its movement the force will be zero due to Newton's second law: $F=ma$; if the acceleration is zero then the force is zero. Anyway the ball will keep moving because of the inertia.