Answered

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Is it possible for an object that has a constant negative acceleration to change the direction in which it is moving.

Sagot :

Hippalectryon
It is possible.

Consider an object that is moving forward. If it gets a constant negative acceleration, then its speed will decrease. When it becomes negative, the object will move backwards : it will have changed its direction.
AL2006

Of course !  If you call "up" the "positive" direction, then that's exactly
what happens every time you toss a stone or a ball up into the air.

The stone or the ball starts out with upward (positive) velocity.  But the
acceleration of gravity is downward (negative).  The  effect on the ball is
that its positive velocity becomes smaller and smaller, eventually reaches
zero, and then becomes negative when the ball or the stone starts moving
downward.


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