Answer:
A
Explanation:
When friction slows a sliding block, <u>the kinetic energy of the block is transformed into internal energy
.</u>
<em>The frictional movement of two surfaces over one another leads to the conversion of some of their kinetic energies to another energy - heat or thermal energy. Hence, the temperatures of the objects are raised in the process. </em>
<u>Therefore, when a sliding block is slowed down due to friction, some of the kinetic energy of the block would be transformed into internal energy in the form of heat.</u>
The correct option is A.
Https://www.google.com/search?q=Why+do+atoms+have+an+overall+neutral+charge%3F&oq=Why+do+atoms+have+...
Neutrons are no exception. So, if an atom<span> has equal numbers of electrons and protons, the </span>charges<span> cancel each other out and the </span>atom<span> has a </span>neutral charge<span>.
</span>
The mass of the electron is 
Kg.
<h3>How can we calculate the mass of the electron?</h3>
To calculate the mass of the electron we are using the formula,
Here we are given,
=The rest mass of an electron = 
kg.
v= The velocity of electron = 0. 85c.
c= The velocity of light = c. (c=
m/s)
We have to found the mass of an electron = m Kg.
Now we substitute the known values, we found that,
Or,
Or,
Or, 
Kg.
From the above calculation we can conclude that, The mass of the electron is Kg.
Learn more about electron:
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