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Answered 2014-05-18 19:30:17

All experimental observations until now are in unanimous agreement that

such an event cannot occur. Within the limits of our ability to measure

the relevant quantities to date, it appears to be impossible.

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

Only for an instant. Acceleration is a change in velocity. When the derivative of acceleration with respect to time is zero, the velocity would be zero.

Yes. F=ma if f is non zero then a is non zero and the velocity changes if the particle is not constrained, free to move.

Yes, if it returns to its starting place, the average velocity for the cycle will be zero. The average SPEED, however, will not be zero.

Yes, since velocity is speed and direction its average can be zero. For example say a plane flies from point A to point B at 300 mph and turns around to go from B to A at 300 mph; its average velocity is 0 since it is in the same spot as it started ( the velocity vectors cancel) but its average speed is 300 mph.

There are fundamental errors in the question. A particle is three dimentional and cannot exist in a one dimentional universe, nor can velocity.

Yes. If the velocity doesn't change, there is zero acceleration.

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,

Yes. If the net force is not zero, the particle accelerates. Accelerate means the velocity changes,if the velocity changes the kinetic energy of the particle changes.

If the car has an average speed of 65 mph, when it returns to its starting point, it will have a displacement of zero and an average velocity of zero, because velocity has both speed and direction.

If the velocity equals zero, the acceleration is also zero because the velocity hasn't changed, thus, the particle isn't accelerating anywhere. This is not exactly true; at an instant in time the acceleration can be non-zero while the velocity is zero. However, this would change the velocity to non-zero after any amount of time. An example of this is when you throw a ball into the air: at it's highest point, the velocity is zero (it changes from going upward to going downward, passing through zero for an instant). However the acceleration is downward the entire time.

The average acceleration from zero is the final velocity divided by the amount of time to reach that velocity.

It is not possible because the average velocity is equal to the displacement in a given time interval, ie: V = (displacement) / (time interval) As the zero displacement average speed will also be zero.

No, you cannot have a zero displacement and a nonzero average velocity. If the object has not moved any where how can you attain a nonzero velocity? You cannot.

A particles velocity can be zero by way of a repulsion force stopping it from any initial velocity greater than zero.....The particle will then obtain a velocity in opposite direction if repulsion force is maintained. The crossover of the two velocities is zero. Submitted...Ed kobek bsee northwestern U.

Zero acceleration is when a particle doesn't move in an amount of time, thus the velocity is a constant.

Because squaring a velocity removes its sign. A velocity may be negative, but it's square is always positive. If two velocities are +5 and -5, their average is zero. But both squares are +25, so the average square is +25.

The gas molecules are in motion but if the total gas volume is stationary (Eg. closed in a container) the average gas velocity is zero. And since the square of any number is never negative. And not all molecules have zero velocity at a time. Therefore, since not all numbers are zero and no number is negative the the average of numbers should be a positive number and will not be zero.

Yes. it is possible to have average speed (even average velocity as vector, <v> ) to be zero. But the velocity in a given time is not zero. A famous example is electron in magnetic field. It has velocity but orbiting (classically), however it's average position is the same (quantum mechanically), so the electron stays there and do not go anywhere (no current).

A particle moving with a constant velocity has no acceleration. Acceleration is the change in velocity over time. If the velocity is constant, there can be no acceleration. For you Calculus junkies, dv/dt (v is velocity) is acceleration, and will equal zero if v is a constant.

The average velocity is pretty close to zero. Velocity is a vector, so its average value is the total displacement divided by the total time. Since the racquet probably starts and finishes in the player's bag in the player's home, the average velocity is zero.

When a pendulum reaches its maximum elongation the velocity is zero and the acceleration is maximum

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