Gravity is the force accelerating the ball downward, both while the ball is rising and while it's falling, and in the instant between those two intervals the reaction force to the earth's gravity pulling the ball downward is seen in the smaller acceleration of the earth in the same direction - that is, downward and away from the ball the reaction force in both directions is air friction, slowing it down both ways the only force acting on the ball is the one I exerted originally when I threw the ball upward;
(Gravity; is; the force accelerating the ball downward) (the one; exerted; T:originally; T:when I threw the ball upward) (the force; accelerating downward; the ball) (the reaction force in both directions; is; air friction) (the ball; is rising; ) (it; 's falling; ) (I; threw upward; the ball) (the only force; acting; on the ball) (those two intervals; pulling; the ball)
Gravity the one the force the reaction force in both directions the ball it I the only force those two intervals
is exerted accelerating downward is is rising 's falling threw upward acting pulling
the force accelerating the ball downward
T:originally T:when I threw the ball upward
the ball
air friction
the ball
on the ball
the ball