Question

Cite is example when moving body having certain speed has zero velocity

Answer 1

If you are at rest, you will have zero speed which will give you zero velocity with respect to the Earth; however gravity is still acting on you which is an acceleration. The reason you don't move is because you have another force (the normal force) countering your weight, which gives you a net acceleration of zero.

Answer 2

A car that is traveling around a rotonda, that is it started from a certain point in the rotonda, moved around the rotonda and returned to that point, is an example of a body having zero velocity yet stil has acceleratrion.  

Velocity is a vector quantity. That means it both includes magnitude and direction. "400 mph" is an example of magnitude and it means it is not a vector. But if we say "400 mph east", it is an example of velocity and is a vector quantity.  

Velocity is defined as the ratio of displacement and time. Note that displacement is different from distance . Distance is usually larger than displacement. Displacement is characterized by how far that a body had traveled from a reference point through a straight line while distance disregard this straight line.  

So in the case above the car have acceleration but the velocity can be zero. Wether the car changes it speed during intervals of time or not, it always have acceleration. Remember that the displacement of the car in the rotonda will be zero because it returned to its starting (reference) point. From the formula of velocity of that v(velocity)=d(displacement)/time, we can calculate the velocity of the car by giving an arbitrary value for the time and its displacement. Shall we say its time elapsed is 20 seconds and the displacement is 0 m. Then the velocity is 0 m/20 sec or 0 m/sec or 0.

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