Acceleration and speed

  • #1

Homework Statement



1.JPG

Homework Equations




The Attempt at a Solution


Since at N the gravity is now heading down towards the person in a positive direction it's acceleration is G, where as velocity goes up then comes down towards the person so it's velocity is now negative, thus -V, but the correct answer is A?? Why do both components stay the same?
 

Answers and Replies

  • #2
gneill
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Hint: Is speed the same thing as velocity?
 
  • #3
Hint: Is speed the same thing as velocity?

Yep, you're right, I confused speed and velocity. So now I understand why speed V is the same.

But for gravity, why has that not changed?
 
  • #4
gneill
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Yep, you're right, I confused speed and velocity. So now I understand why speed V is the same.

But for gravity, why has that not changed?
The Earth didn't move? :smile:

The direction of the gravitational acceleration vector in the chosen inertial reference frame is independent of the motion of the projectile. Down is still down.
 

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