Physics when is gravity negative

Note that when an object is projected upward, reaches its maximum displacement and starts moving downward, the displacement is negative above the starting point and positive below the starting point.

Displacement is measured from the starting point. Displacement vectors in a horizontal direction are designated as positive toward the right direction and negative toward the left. Vectors at an angle can be broken into their components on the x-y axes. Velocity is a vector that is the change in displacement with respect to time in a specific direction. It is measured from a given displacement. Velocities in the same direction as gravity are positive and velocities in the opposite direction are negative vectors.

The magnitude of a velocity vector is the speed in the given direction. It is also the absolute or positive value of the velocity. It is possible for a velocity at a negative displacement to be in the direction of gravity and be a positive vector. This is seen in the case of throwing a ball upward and having it fall toward the ground.

Velocity vectors in a horizontal direction are designated as positive toward the right direction and negative toward the left. Vectors at an angle can be broken into their components on the x-y axis. Gravity equations require a convention, stating which direction is positive and which is negative.

We consider the direction of gravity as positive and the upward direction as negative. Displacement is positive below the starting point and negative above.

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