<span>Since the trains area headed in completely opposite directions, the rate at which they gain distance from each other is simply equal to the sum of the magnitudes of their velocities, in this case 85 + 75 = 160 miles per hour. Therefore, the amount of time it will take for them to be 352 miles apart is 352/160 = 2.2 hours, or 2 hours and 12 minutes.</span>
Potential energy = mass x acceleration due to gravity x height
= 2.5 x 9.8 x 2.2
= 53.9 J.
Hope this helps!
Explanation:
Wavelength in an emission spectrum, 
The energy of an electron is given by :
Where
h is the Planck's constant
c is the speed of light
For 435 nm, the energy of the electron will be :
We know that 
So, 
So, E = 2.86 eV
The energy of the electron dropping from one energy level is 2.86 eV. We know that,
From the given energy levels :
So, the transition must be from E₅ to E₂. Hence, this is the required solution.
Friction, gravity, normal force, drag force, tension force and human force are the forces that occurs on free body.
<h3>What are the forces in a free body diagram?</h3>
There are large number of external forces acting on an object such as friction, gravity, normal force, drag force, tension force and human force due to pushing or pulling. These forces can cause the motion of the free body which is present at rest form or can stop a body which is moving. A free-body diagram is a useful means of describing and analyzing all the forces that act on a body to determine equilibrium.
So we can conclude that friction, gravity, normal force, drag force, tension force and human force are the forces that occurs on free body.
Learn more about force here: brainly.com/question/388851
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D. both b. and c. Obviously adding more gas but reducing the volume because of the limited space in the container.
