Ans: A quantity cannot have units until it has dimensions. A quantity that has dimensions must have units. Yes a quantity have units but still be dimensionless for example,unit of angle is radian ,but it is a dimensionless quantity. A dimensionless quantity may have unit.
Answer:
The crumpled paper hits the ground first due to air resistance. The crumpled paper has less surface area than the flat paper, therefore the crumpled paper hits first.
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Answer: kinetic energy
Explanation: Kinetic energy has motion which is a moving object
1. It’s true
4 ,7 ,8 is correct
That is an opinion. Opinion is not fact, although it can be based upon fact.