2. newton's first law says that
a. an object that is not moving, or is at
will stay at
which means at
and
b. an object that is moving will keep moving with constant
the same
and in the same
c. an
force acts on that object.
unless

the coeerct answer is answer A but you are missing a few words

Explanation:

Newton's 1st Law states that an object that is not moving, or is at REST, will stay at REST, and an object that is moving will keep moving with constant VELOCITY, which means at the same SPEED and in the same DIRECTION, unless an UNBALANCED FORCE acts on that object.

yes

explanation:

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it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.