Velocity and Acceleration: Possible Scenarios?

[hasanhabibul]

1)a body having zero velocity but acceleration not zero...and 2)a body having constant velocity and variable acceleration...which one is impossible. or both are correct or neither is.

 

[Doc Al]

What do you think?

 

[IBY]

@hasanhabibul
For the first one, think about a ball being thrown up, stopping, and going down.

 

[hasanhabibul]

i think both are impossible...both seems to be very strange to me...but myresult is not correct..i have known it from the answer...at least both will not be impossible...either or both will be possible ..

 

[Doc Al]

(1) What about IBY's example of a ball tossed straight up in the air? What's the acceleration? What's the speed at the very top of the motion?
(2) What's the definition of acceleration?

 

[IBY]

If the ball slows down, that means there is a force, ie. gravity. If there is a force, what does that imply that there is? Plus, after the ball slows down and stops, it goes down again, which means that force is still being applied. Note, velocity is changing throughout the whole process.

 

[hasanhabibul]

ohh thnx both of u...i got it