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Q: Can the average velocity of a moving body be zero?

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Yes; for example, an object moving in a circle.

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Since speed is a scalar quantity, the only way the average speed can be zero is if the instantaneous speed is at all times zero, making it not a moving body, so no on the average speed. The average velocity, on the other hand, can easily be zero. The simplest example is you running in a circle.

An object moving in a circular path at constant speed will have a non-zero average speed and zero average velocity since velocity is a vector parameter,

if it is not moving

A body moving with uniform velocity has zero acceleration.

Acceleration is zero when the body is moving with a constant velocity. This is one of the newton's laws.

A pendulum could, because it's moving backward as fast as it's moving forward.

Nein. If it's moving, by definition it has non-zero velocity.

Yes, if, for example, a car races around a circuit, its total displacement is zero and so its velocity, at the end of every lap, is zero.

Zero, since the velocity doesn't change.

No, it can't. Average VELOCITY can be zero, though.

Acceleration is the CHANGE in velocity; you're assuming CONSTANT velocity. So the acceleration is zero.

Yes. that acceleration is zero.

zero because the initial and final velocity is constant . so,difference bet. final velocity and initial velocity is zero

zero because the initial and final velocity is constant . so,difference bet. final velocity and initial velocity is zero

For an instant, yes - otherwise there would never be any motion. When the object starts moving, it initially has zero velocity.

A body is moving at constant velocity including zero at Equilibrium Condition, No change of energy or zero force. With force a body can accelerate, move with increasing velocity.

If an object doesn't move, then its velocity is zero.

The body is not zero, but the sum of all forces on it is. -- "Uniform velocity" means no acceleration. -- Acceleration is force/mass . -- If acceleration is zero, that's an indication that force must be zero.

As long as it has a non-zero velocity, it will have a non-zero momentum.

Average velocity is zero if the displacement is zero. Average velocity = Displacement/Time = 0/Time = 0.

When an object is not moving. (Velocity is speed)

If you have no velocity, then you aren't moving.

If you have no velocity, then you aren't moving.