Basic Motion Graphs (velocity-time)

[PolyFX]

Momentum & Net Force Question

Okay, so I got the previous question I asked and I had another new question to ask so rather than make a new topic and seem like I'm spamming the forums, I just decided to edit my original post. I just hope no one replies to my old post while I'm writing this one!

Homework Statement

A ping-pong ball whose mass is 0.0027 kg (2.7 g) is acted upon by the Earth and the air (there is air resistance, and there is also a strong wind). This table gives the position of the ball at several times:
Time Position

12.35 s < 3.17, 2.54, -9.38 > m
12.39 s < 3.25, 2.50, -9.40 > m
... ...
14.35 s < 10.17, -1.16, -10.40 > m
14.39 s < 10.37, -1.27, -10.42 > m


In the time interval from 12.35 s to 14.35 s, what was the average net force acting on the ball?

Homework Equations

Fnet = P/t where p is momentum and t is time interval
Fnet = -mg

The Attempt at a Solution

First I get the displacement by subracting the final position vector - initial position vector. I then divide that vector by the time interval (2 seconds) to get the average velocity. I use the formula p = mv to find the momentum.

I rearrange the formula p = fnet( t ) to isolate for fnet
so fnet = p/t.

However, with this method I do not get the right answer.

 

[PolyFX]

Okay, so I got the previous question I asked and I had another new question to ask so rather than make a new topic and seem like I'm spamming the forums, I just decided to edit my original post. I just hope no one replies to my old post while I'm writing this one!

 

[tomcue]

I would first clarify what is meant by "right answer" in this context. Are we looking for the magnitude of the net force, or the vector sum of all forces acting on the ball? Additionally, I would consider the fact that there is air resistance and a strong wind, which would affect the motion of the ball and therefore the net force acting on it.

To accurately calculate the net force, we would need to consider all the forces acting on the ball, including gravity, air resistance, and the force of the wind. This would require more information, such as the velocity of the wind and the magnitude of the air resistance force. Without this information, it would be difficult to accurately determine the net force acting on the ball.

In terms of the given data, we can calculate the average velocity and momentum of the ball, but this does not give us the net force. We would need to take into account the effects of air resistance and the wind to accurately determine the net force. Additionally, we would need to consider the direction of the net force, as it is a vector quantity.

In summary, to accurately determine the net force acting on the ball, we would need more information and would need to consider all the forces acting on the ball, not just its momentum and velocity.