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Answers
Rest: If a body does not change its position with respect to its surroundings, the body is said to be at rest.
Motion: A body is said to be in motion if it changes its position with respect to its surroundings.
Distance is a scalar quantity that refers to how much ground an object has covered during its motion.
Displacement is a vector quantity that refers to how far out of place an object is.
Meters are used to measure distances in races, such as running and swimming. It is also used to measure a fence for your backyard, or the width of a house.
• Models of transport used on land are bus cycle.
• Models of transport used in water are ship boat.
• Models of transport used in air are jet aeroplane.
Wind power was used to pull vehicles in ancient times.
Measurement, the process of connecting numbers with physical quantities and phenomena.
Cubit is not used as standard units of length because their sizes vary from person to person. So, two different persons may give different measurements for the same length, which is not desirable for a standard unit.
i) 100cm
ii) 5000m
iii) Periodic motion
iv) Rolling motion