Answer:
Stars emit colors of many different wavelengths, but the wavelength of light where a star's emission is concentrated is related to the star's temperature - the hotter the star, the more blue it is; the cooler the star, the more red it is
 
        
             
        
        
        
The potential difference across 3 Ohm resistor is 20V.
The resistors are connected in parallel which means all the three resistances have a fully potential difference of 20V.
 
        
             
        
        
        
John can run with the velocity of 5 m/s
Explanation:
- Kinetic energy is defined as the energy is being used to do an activity, basically energy associated with the motion of objects in the universe.
- The formula used to find the kinetic energy of an object is k =  where as k represented as kinetic energy, m is the mass of the object and v is the velocity of the given object. where as k represented as kinetic energy, m is the mass of the object and v is the velocity of the given object.
- Here, to find the answer we have to re-write the equation as ![v = \sqrt[2]{\frac{2 k}{m} }](https://tex.z-dn.net/?f=v%20%3D%20%5Csqrt%5B2%5D%7B%5Cfrac%7B2%20k%7D%7Bm%7D%20%7D) 
- Given, the mass of the object, here it is John = 80 kg, energy needs to be converted to kinetic energy, k = 1000  J.
- Hence, substitute all the values, then you would velocity as 5 m/s 
 
        
             
        
        
        
Zero acceleration means the object's velocity is not changing.
So the object is moving in a straight line, at a constant speed 
that could be anything (including zero) as long as it's constant.