The forces acting on a ball just after it's released from the thrower's hand is gravity.
A force refers to a push or pull of an object such as a ball, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.
Gravity can be defined as a force of attraction that controls the movement of an object such as a ball and the planets around the Sun.
In this scenario, the forces acting on a ball just after it's released from the thrower's hand is a force of gravity or gravitational force since it was thrown horizontally.
Read more on force here: brainly.com/question/1121817