- #1
danny20051
- 13
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A ball travels vertically downwards until it hits a concrete floor with speed 16.1-m/s. It then bounces vertically upwards at 3.4-m/s. Examination of a high speed video shows that the collision took 1.1-ms. Considering just the collision, what is the magnitude of the average acceleration?
b)
For some balls, the acceleration of the center of the ball, in a collision like this, is fairly constant. So, assuming constant acceleration, what is the maximum deformation of the ball? (i.e. what is the maximum distance that the center of the ball travels downwards?)
I believe this should be delta V/time, however the answer comes out wrong.
I have 3 attempts at the question and each wrong answer 33.3% of the mark is lost so I'm scared to attempt the question again without being certain.
There is also part b) which I have 0 idea how to even start.
So what I have done is:
(3.4+16.1)/0.0011 = 19500 (edit: divided by 0.001, should be 17727.273. Is this correct?)
0.0011 for time as it was given in milliseconds
As for direction it asks for magnitude so it should be irrelevant
I also found this thread and it seems like I'm doing it right so I'm really confused.
https://www.physicsforums.com/threa...e-acceleration-during-point-of-impact.797568/
Any ideas what I'm doing wrong?
Thanks,
Danny
b)
For some balls, the acceleration of the center of the ball, in a collision like this, is fairly constant. So, assuming constant acceleration, what is the maximum deformation of the ball? (i.e. what is the maximum distance that the center of the ball travels downwards?)
I believe this should be delta V/time, however the answer comes out wrong.
I have 3 attempts at the question and each wrong answer 33.3% of the mark is lost so I'm scared to attempt the question again without being certain.
There is also part b) which I have 0 idea how to even start.
So what I have done is:
(3.4+16.1)/0.0011 = 19500 (edit: divided by 0.001, should be 17727.273. Is this correct?)
0.0011 for time as it was given in milliseconds
As for direction it asks for magnitude so it should be irrelevant
I also found this thread and it seems like I'm doing it right so I'm really confused.
https://www.physicsforums.com/threa...e-acceleration-during-point-of-impact.797568/
Any ideas what I'm doing wrong?
Thanks,
Danny