The speed of a moving object relative to an observer in another moving object is called .....................speed, irregular, average, uniform, relative, . If the relative speed of a car is 20 km/h relative to an observer in a bus moves in the same direction at 40 km/h, therefore the actual speed of this car is, 20 km/h, 40 km/h, 60 km/h, 80 km/h., If car (A) moves at speed 80 km/h and car (B) moves at speed of 50 km/h in the same direction, the speed of car (A) relative to a passenger in car (B) is...................km/h, 50, 30, 130, 80, An observer in a moving car with 80 km/h speed was observing a moving car with 90 km/h speed in the same direction, so the observed speed of the second car is, 10 km/h, 80 km/h., 170 km/h, 90 km/h, The relative speed of a moving object relative to an observer moves at the same speed in the opposite direction is .......................the actual speed., double, the same, half, quarter.

grade 9

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