Discover Acceleration Questions and Answers with Given Data

[1irishman]

Does anyone know the answers given the following data?

The direction of the acceleration is the same as the direction of the "PUSH." Describe what would happen to the velocity of the object if it was:

a)accelerating right (+i), initially at rest


b)accelerating right (+i), initially moving to the right (+i)


c)accelerating right (+i), initially moving to the left(-i)

The Attempt at a Solution

a)the object would have increasing velocity

b)the object would have increasing velocity

c)the object would have decreasing velocity

those are my guesses

 

[Feldoh]

Those are right, but you called them "guesses", so what was your rationale for those answers?

 

[1irishman]

a and b are the magnitude for velocity and c is the direction and magnitude? That was my rational...is that right?

 

[Feldoh]

Sort of, positive acceleration in the same direction as velocity means an increase, while a positive acceleration in the opposite direction as velocity means a decrease (well, at least initially).

 

[1irishman]

Okay, thank you! So for example: would a positve acceleration in the opposite direction of the push be say like...tossing a ball straight up in the air? The push being my hand tossing the ball up and the acceleration being gravity?