Which sentence shows that maglev trains create specific challenges?
A
They go up to 600 kilometers per hour
(around 370 miles per hour).
B
Maglev trains are moved by electric
motors located in the guideway.
С
These magnets use less electricity than
conventional electromagnets, but they
must be cooled to temperatures as low
as minus 267 degrees Celsius (minus 450
degrees Fahrenheit).
D
This raises the train off the track a few
centimeters into a "floating" position.

Answerthe force between the charges will be  f/9 (one-ninth of force f)explanationcoulomb's law relates the magnitudes  two point charges q₁ and q₂, the distance, r, between the charges, and the electrostatic force, f, between the two charges:     k represents coulomb's constant, k = 8.99×10⁹ n·m²/c².note that if we have r = 3r, then   

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.

Ansa new gas is observed in the form of bubbles;