Velocity and acceleration

Question

Can an object have zero velocity and nonzero accelera- tion at the same time? please give examples.

Answer 1

Not for any extended time, but it is possible for a moment. Because acceleration is defined as the rate of change of velocity, if acceleration is non-zero then the velocity must be changing.

But let's consider a ball being thrown straight into the air. While it's flying through the air, gravity is always accelerating it downward at a rate of g = 9.81 m/s^2. At some point, the ball will stop rising and start falling. At that moment, its velocity must be zero, but it has non-zero acceleration.|

So the scenario is possible, if only for an instant.