Physics vertical motion question

[chaput]

Hi..this is a question that may be simple but I am kind of stuck on:(

1. A girl tosses a marble straight up into the air at 5m/s and then catches it at the same height from which it was thrown. Ignore air resistance.

a) is the acceleration of the marble on the way up the same as, less than or greater than its acceleration on the way down? Justify your answer.


P.s The answer is 'same as' but why and how??

Thanks

[M909]

The only acceleration(because  question ignores wind resistance),  is the constant given by gravity in the downwards direction (usually -9.8 m/s^2). This is the only thing that affects the rate of change of velocity. The velocity itself will go from positive, to zero (at the top) then negative/downwards direction. I think you may be confusing velocity and acceleration. Hope this helped

[Bri MT]

We treat gravity as being constant near the surface of the earth.  Therefore, acceleration due to gravity will also be constant. 

This change in velocity is why the marble slows down on its upwards trip and speed up on the downwards one


As M909 had said

[chaput]

The only acceleration(because  question ignores wind resistance),  is the constant given by gravity in the downwards direction (usually -9.8 m/s^2). This is the only thing that affects the rate of change of velocity. The velocity itself will go from positive, to zero (at the top) then negative/downwards direction. I think you may be confusing velocity and acceleration. Hope this helped

Thanks a lot for the help!

[chaput]

We treat gravity as being constant near the surface of the earth.  Therefore, acceleration due to gravity will also be constant. 

This change in velocity is why the marble slows down on its upwards trip and speed up on the downwards one


As M909 had said

Thank you!!