Q:

# Can an object have a northward velocity and a southward acceleration?

A:

Yes, an object can be moving at the same time that it is also slowing down. During this period, its acceleration is in the opposite direction of its velocity.

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One example of an object having a northward velocity and a southward acceleration is a ball thrown upward. The velocity of the object will depend on the strength of the throw, while its acceleration would be -9.8 m/s/s, since it is going against gravity. As this negative acceleration overcomes the ball's velocity, it will reach its maximum distance and fall back toward the ground. This time, during the free fall, the velocity and the acceleration are already in the same direction.

## Related Questions

• A:

When the acceleration of an object is zero and the velocity is positive, the object continues to move at a steady velocity in the same direction. The object cannot be changing direction because direction change results in non-zero acceleration.

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• A:

An object does not have a varying speed if its velocity is constant. A constant velocity implies that an object is moving in a straight line at an identical rate over time.

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• A:

Terminal velocity is the velocity at which an object in freefall no longer accelerates due to gravity because the drag force of the surrounding air equals the gravitational force of Earth. Objects with more mass have more weight, and it takes more drag force to reach terminal velocity.