Indeed, there are only three things to consider: the length of the net during the swing, the speed of the MJ at the bottom of the swing, and the mass of the MJ. Finding the table is the easiest. I can just look for the measurements of Zendaya Coleman, who plays MJ. I’ll go with a weight of 59 pounds, an estimate of a page with a biography of a celebrity – this may not be accurate, but in the end this value does not matter much.
For the length of the grid (and therefore the radius of the circular motion) I compare their movement as they pass a building. Based on the counting of the rows of windows in the building, it appears that the grid is at least 8 storeys long. There is no standard height for the history of the building, but let’s just continue with 4 meters per level, for a total length of the network of 32 meters.
The speed is a little harder, but I will do my best to get a reasonable value. If I know the distance that MJ and Spidey travel (I will call it Δs) and the time it takes to cover that distance (Δt), then I can calculate the average speed.
The weather is not too difficult. Looking at one of the swings, I can note the footage showing the beginning and end of the movement. Since the trailer is recorded at 24 frames per second, I can get time data from the frames. Using this, I get a time of 0.417 seconds from the beginning of the swing to its lowest point.
Now, if I estimate the initial swing angle ((), I can get the distance from the arc length (arc length = rθ). Let’s go with an initial angle of 30 degrees.
That’s all I need. Here are my calculations using a Python program. You can edit and change the values and restart them if you want to try different values.
Using my calculations, MJ and Spidey would be moving at almost 90 miles per hour (40 meters / second), and MJ would have to maintain an equivalent weight of about 800 pounds (3555 newtons).
Sometimes it is useful to talk about such things as g, where 1 g is equal to 9.8 m / s2. One g is what you feel if you just sit still, without acceleration.