Answer:
Allotropes
Explanation:
Because it is the same element the chemical conposition is the same i.e. The atoms that make the substances are identical. Allotropes can be crystalline or amorphous and sometimes they can be varied in properties.
No, because the distance-time would show a constant velocity but the velocity-time graph shows an increasing velocity.
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Answer:

Explanation:
As per the equation of voltage on capacitor we know that

now we know that voltage reached to its 80% of maximum value in 4 second time
so we will have





as we know that


