Astudent said, "the displacement between my dorm and the lecture hall is 1 kilometer."
is he using the correct physical quantity for the information provided? what should he have called the 1 kilometer?

a) distance
b) path length
c) position
d) both a and b are correct.

d) Both a and b are correct

Explanation:

Displacement: It is defined as the distance between initial and final position during motion.

Distance: It is defined as the total path length traveled by object

Or

It is the distance of one place from other place.

Student said that the displacement between my dorm and the lecture hall is 1km.

It is not displacement .It is distance or we say path length.

Therefore, he is using  incorrect physical quantity for the information provided.

He should have called distance 1 km or path length 1 km.

Option d is true.

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the answer would be   dignified - apex