The greatest force acting on the ball to slow it down is Gravitational force.
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Which forces will act on the ball?</h3>
When ball is thrown upwards then there will be two forces on the ball opposite to the motion of ball
1. Gravitational force (mg)
2. Air friction or air drag
Both forces are opposite to the motion of the ball and it will cause the decrease in the speed of the ball.
Now here due to less value of drag coefficient on the ball we will say that ball will decrease its speed more due to gravitational force compare to friction force of air.
To learn more about gravitational force from the given link
brainly.com/question/4457104
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